By the way, no need to guess how the money went down. They were acquired by a public company, who filed all of the agreement with the SEC, who made said filings available on the web. They're pretty interesting if you're into that sort of thing.
I think this is the first public break down of a ycombinator company ever.
For all those interested: http://www.edgar-online.com/bin/cobrand/?doc=A-1108630-00011...