I thought about a great idea for GPS-phones too! If you wake up in the morning and have no idea where you are and how did you end up there, then this application would tell your exact location, address, and a name of yours as well as of a person who's sleeping next to you. The target market is hard partying college students. I would call it WhatHappenedToMe.
This is Argyn's blog. I comment on topics of my interests such as software, math, finance, and music. Also, I write about local events in Northern Virginia, USA and all things related to Kazakhstan