Freecache

http://slashdot.org/article.pl?sid=04/05/12/1635205

"TonkaTown writes "Finally the solution for slashdotting, or just the poor man's Akamai? Freecache from the Internet Archive aims to bring easy to use distributed web caching to everyone. If you've a file that you think will be popular, but far too popular for your isp's bandwidth limits, you can just serve it as http://freecache.org/http://your.site/yourfile instead of the traditional http://your.site/yourfile and Freecache will do all the heavy lifting for you. Plus your users get the advantage of swiftly pulling the file from a nearby cache rather than it creeping off your overloaded webserver."

http://www.archive.org/web/freecache.php