What we are thinking of doing

GPS-enabled ads and coupons piped to your mobile phone at just the right time and place. Location-based marketing is a concept that's been bandied about for years, but only now is the required technology becoming cheap enough to implement. Companies like Yahoo and Google, meanwhile, have proven inept at building quality services for wireless carriers. Though the timing is ideal for a startup to build the technical pieces, persuading customers to sign up for a steady barrage of marketing offers may prove the bigger challenge. The behavioral piece is the biggest uncertainty, but you've got to make your bets now.