AngelList is the real deal. I've heard quite a few people having some success there. Even as a YC company, there is a startling hole after Demo Day... It can take months to close a round (it took us 5ish), even loaded down with Demo Day biz cards and meeting invites. If I were doing YC again today, I'd try to get on AngelList right after Demo Day...
Dave Lifson, a Postling founder, describes the process from his point of view:<p><a href="http://caterpillarcowboy.com/post/489762022/the-inside-story-on-how-i-raised-200k-in-6-days" rel="nofollow">http://caterpillarcowboy.com/post/489762022/the-inside-story...</a>