I don't think there's any public list of non-launched YC companies, but the ones which have launched are listed at <a href="http://ycombinator.com/faq.html" rel="nofollow">http://ycombinator.com/faq.html</a> .
The latest number I heard is 102, but I think it's more, if you consider adding the latest round that included divvyshot.<p>You will find some here: <a href="http://ycombinator.com/faq.html" rel="nofollow">http://ycombinator.com/faq.html</a>
at the first question.
And you will find some here:
<a href="http://en.wikipedia.org/wiki/Y_Combinator" rel="nofollow">http://en.wikipedia.org/wiki/Y_Combinator</a><p>Also consider searching TechCrunch for ycombinator, as they write about the startups that's funded by YC.