[atduarte]

Exists already: http://www.tripaya.com/

[kuisch]

I'm familiar with Tripaya. As pointed out earlier, there are a few others with a similar approach. There's no real network effect here, so I expect that 1) there will be less of a winner-takes-all dynamic (i.e. room for more than 1 player) and 2) it won't be so much about who gets there first as about who gets it right.