Computer services, namely, remote management of information technology (IT) systems of others comprised of electronic messaging systems for others; Computer services, namely, remote management of information technology (IT) systems of others comprised of electronic messaging systems for others that allows users of mobile phones, portable media players, handheld computers and related mobile devices to communicate with each other; Providing temporary use of non-downloadable web-based messaging software applications that allows users of mobile phones, portable media players, handheld computers and related mobile devices to communicate with each other; Providing temporary use of non-downloadable web-based messaging software applications that allows users of mobile phones, portable media players, handheld computers and related mobile devices to send and receive messages among guests of lodging accommodations owned and hosted by others and among the hosts who list lodging accommodations for rent; Providing temporary use of a non-downloadable web-based software application for providing an online marketplace for buyers and sellers of services on a global computer network; Providing temporary use of a non-downloadable web-based software application for providing a two-way system for users of an online marketplace to evaluate and provide feedback regarding parties they have interacted with via the online marketplace; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to plan, announce, invite others to attend meetings and events; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to arrange for the remote exchange of keys to lodgings and homes and for locking and unlocking lodgings and homes; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to manage, organize, calendar and share with others activity dates, photographs, opinions and preferences; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to arrange for temporary lodging check-in help; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to list real property for rent and receive suggested improvements to their listing advertisements; Providing temporary use of a non-downloadable web-based software application that facilitates use of the internet by users of mobile phones, portable media players, handheld computers and related mobile devices; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to facilitate the sale of services via computer network and to provide evaluative feedback and ratings of sellers' services, the value and prices of sellers' services, buyers' and sellers' performance, delivery, and overall trading experience in connection therewith; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to list and rent temporary lodging, access information, listings and announcements about housing, apartments, condominiums, townhouses, real estate and rental and leasing advertisements for the foregoing; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to provide reviews and feedback about listers and renters of real estate and temporary lodging; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to make payments for the purchases of services; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to search for temporary accommodations, and for making reservations and bookings for temporary accommodations; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to provide reviews and recommendations for local attractions; Providing temporary use of a non-downloadable web-based software application that allows users of mobile phones, portable media players, handheld computers and related mobile devices to engage in social networking featuring temporary lodging and the rental and listing of real estate; Software as a service (SaaS) services featuring messaging software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to communicate with each other; Software as a service (SaaS) services featuring messaging software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to send and receive messages among renters of lodging accommodations owned by others and among the owners who list lodging accommodations for rent; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to plan, announce, invite others to attend meetings and events; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to arrange for the remote exchange of keys to lodgings and homes and for locking and unlocking lodgings and homes; Software as a service (SaaS) services featuring software management tools that allows users of mobile phones, portable media players, handheld computers and related mobile devices to manage, organize, calendar and share with others activity dates, photographs, opinions and preferences; Software as a service (SaaS) services featuring software management tools that allows users of mobile phones, portable media players, handheld computers and related mobile devices to arrange for temporary lodging check-in help; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to list real property for rent and receive suggested improvements to their listing advertisements; Software as a service (Saas) services featuring software that facilitates use of the internet by users of mobile phones, portable media players, handheld computers and related mobile devices; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to facilitate the sale of services via computer network and to provide evaluative feedback and ratings of sellers' services, the value and prices of sellers' services, buyers' and sellers' performance, delivery, and overall trading experience in connection therewith; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to list and rent temporary lodging, access information, listings and announcements about housing, apartments, condominiums, townhouses, real estate, and rental and leasing advertisements for the foregoing; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to provide reviews and feedback about listers and renters of real estate and temporary lodging; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to make payments for the purchases of services; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to search for temporary accommodation, and for making reservations and bookings for temporary accommodations; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to provide reviews and recommendations for local attractions; Software as a service (SaaS) services featuring software that allows users of mobile phones, portable media players, handheld computers and related mobile devices to engage in social networking featuring temporary lodging, and the rental and listing of real estate