Some of the better comments:
Some startups and annual revenue numbers (unsourced): http://news.ycombinator.com/item?id=375896
Someone who modeled 37signals revenue: http://news.ycombinator.com/item?id=375771
Nextproof and bigfolio.com http://news.ycombinator.com/item?id=375575
Hope that helps!
Well, I don't really "like" it, as I could hardly care less about bingo cards, but it's a nice reminder that there is money even in what seems like really weird niches.
http://kalzumeus.com/2008/12/21/bingo-card-creator-year-2008...
Highlights:
* $20.7k in sales from 1/1/2008 to 12/21/2008
* $10k in profit, which is about 62% YOY growth (did I hear something about a recession?)
* Works out to about $100 an hour. (It is a part-time thing at the moment.)
* Taking myself full-time in 2009, hopefully. (Got another product in the works.)
FWIW Mibbit makes real money, all from advertising at the moment. Premium paid accounts are planned, but it's a lot more work than just putting some useful adverts up.
Fair enough to only consider one though :)
We've never sold advertising before (though we do have decent traffic on http://grader.com).