The latest number I heard is 102, but I think it's more, if you consider adding the latest round that included divvyshot.
You will find some here: http://ycombinator.com/faq.html
at the first question.
And you will find some here:
http://en.wikipedia.org/wiki/Y_Combinator
Also consider searching TechCrunch for ycombinator, as they write about the startups that's funded by YC.