Off the top of my head: Pierre Omidyar with Ebay. Gabor Cselle with reMail. Mark Zuckerberg with Facebook (cash flow positive, at least). Max Levchin with S

Off the top of my head: Pierre Omidyar with Ebay. Gabor Cselle with reMail. Mark Zuckerberg with Facebook (cash flow positive, at least). Max Levchin with Slide.com. And a few others I can't really talk about (they like their low profile). Personally, as a single founder, I wish I had some cofounders. Next time I probably won't go it alone.