Wired’s Vanity Validator widget for iGoogle, found on the Julia Allison Wired article:
How famous are you online? Inspired by Chris Anderson’s best-selling book, The Long Tail, this gadget uses Google’s PageRank™ technology to give you a number based on how many good websites mention the name you enter.
Try for yourself:
What's your score? (mine was 50 at this time, not quite famous or fabulous)