Someone asked a similar question awhile back: http://news.ycombinator.com/item?id=375417 http://news.ycombinator.com/item?id=375417 Some of the better comments

Someone asked a similar question awhile back: http://news.ycombinator.com/item?id=375417 http://news.ycombinator.com/item?id=375417 Some of the better comments: Some startups and annual revenue numbers (unsourced): http://news.ycombinator.com/item?id=375896 http://news.ycombinator.com/item?id=375896 Someone who modeled 37signals revenue: http://news.ycombinator.com/item?id=375771 http://news.ycombinator.com/item?id=375771 Nextproof and bigfolio.com http://news.ycombinator.com/item?id=375575 http://news.ycombinator.com/item?id=375575 Hope that helps!