Computer application software for mobile phones, namely, software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that allows users to communicate with each other; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that allows messaging among guests of rental space, accommodations owned and hosted by others and among the hosts who list rental space, accommodations for rent and sale; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that allows users to plan, announce, invite others to attend and evaluate real world meetings and events; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that allows users to solicit each other to perform a wide range of personal and customized services, related services, personalized travel, itinerary and private tour and activity services; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that allows users to arrange for the remote exchange of keys to rentals, homes and vehicles and for locking and unlocking rental property and vehicles; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software management tools to permit users to manage, organize, calendar and share with others travel bookings, activity dates, photographs, opinions and preferences; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software management tools to permit users to arrange for temporary rental check-in help; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that permits listers of goods, real property and services for rent or sale to receive suggested improvements to their listing advertisements; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software that permits listers of goods, real property and services for rent or sale to arrange for professional photographs of the listed goods, property and services; computer application software for mobile phones, portable media players, handheld computers and related mobile devices; computer application software for mobile phones, portable media players, handheld computers and related mobile devices, namely, software to facilitate the sale of goods and services by others via a computer network and to provide evaluative feedback and ratings of sellers