[eviljeff]

real suggestions:

art database. catalog every famous piece of art in the world by artist, location (museum/private collection), estimated value, etc. actually this sounds pretty boring and would rely heavily on user submissions.

sports card (maybe pokemon and magic the gathering crap too) database. lookup how much your [censored] is worth. online trading / sales / auctions. chat. forums. stats. pretty graphs. descriptions of famous collections (jacked from wikipedia of course). maybe even make up some game(s) (tweaked fantasy leagues) based off of all the stats accumulated. you could probably sell ad space to sports book websites. please give me money if you profit from this idea.