In light of all the "location" hype, someone should license branding and data from STA/Lonely Planet and launch a World Travel-themed checkin service.

Think of it: "Eat Pray Love" badges -- check into each location of the book. Badges for each set of landmarks in the world, which are printed on pages of the Lonely Planet guide itself.

The technology is easily outsourcable(especially with the APIs these days), it's the licensing / product development that's worth thinking about.

Negatives: Involves knowing a lot of big-wigs.

Growth Model: Become a franchise representative for locations-based businesses. Partner with travel agencies, airlines, etc., and become a branding agency + coupon clearinghouse for multiple companies.