And just in case you don't get accepted to YC: http://blog.fairsoftware.net/2009/04/07/you-didnt-make-it-to...
I'm just saying, because it's interview season and we already had at least 4 posts on the topic of how to get accepted... If everyone who read these posts got accepted, the YC building would have to add quite a few floors.
Good entrepreneurs are resilient, even in the face of early rejection.