This is what made it click for me: <a href="http://nex-3.com/posts/43-fun-with-the-y-combinator-in-ruby" rel="nofollow">http://nex-3.com/posts/43-fun-with-the-y-combinator-in-ruby</a>
This link (from the comments on the OP) is actually a very interesting yet simple explaination of the Y-Combinator.<p><a href="http://mvanier.livejournal.com/2897.html" rel="nofollow">http://mvanier.livejournal.com/2897.html</a>