whocalled.us
According to the web ad this site will "find out that mysterious phone number is a telemarkter and share comments with other victims of unknown caller IDs."
It works as advertised and has saved me a lot of time on a reverse search for a number on my caller ID from when I was gone for the weekend.
Also check out http://www.YourCallerID.com. You can lookup phone numbers/calls from unwanted callers.
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