I had two experiences this week that made me think "It's a small world after all."
The first was at PDC last week. We set up a meeting with regional directors (RD's) interested in C#. I arrived a little late, so I missed introductions. During the our discussion, I recommended Effective C# to one of the RD's, only to find out that I was recommending the book to the author himself, Bill Wagner. I was a little embarassed at the moment, but I take some solace in the fact that I said nice things about his book :-).
The second was in the KPL demo I blogged about earlier. As part of the demo, they showed some code that a parent in the KPL community had written and contributed. The demo'er said he didn't know who it was, where he/she lived, etc. As it turned out, the contributor was in the room :-). There were grins all around.