Existence of Way Back Machine Stuns Defense

Cindy Johnston, Playboy Enterprise's Internet research manager, said that hundreds of computers have been storing web pages and that she uses the Way Back Machine regularly to check for infringements on Playboy trademarks.
'Wayback Machine' Stars at Sex Court Trial [NY Newsday]

I was able to use this in a domain name cybersquatting action to track the changes made by defendant from commercial to non-commercial site. Great tool.