Came across this today: http://netscan.research.microsoft.com/Static/

The cool thing is this:
http://netscan.research.microsoft.co...horProfile.asp. You
are able to put in your email address and get a nicely presented list of all
postings you have ever made organised by NG. It also either archives the
message or uses Google Groups to pull out an archive of the message. Quite
interesting really.