Have you tried pipl.com?

*edit*
And maybe this article will help. It suggests a few other tools (including Google, which you've tried, and Facebook, which shouldn't be underestimated in finding old friends).

That site (which is my second favorite blog behind Engadget) runs these "top five" things every once and a while, and then they pick the best one in a subsequent post. Pipl.com came out on top here.