We've missed all the fun now, but Lycos were running the controversial make LOVE not SPAM site which, until recently, offered download of a screensaver that would attack the servers of known spammers. The cumulative effect was, apparently, pretty effective in some (but not all) cases, but I guess that the fundamental problem is that the screensaver would ultimately have contributed to the volume of crap on the internet, rather than counteracting it.
The site now only asks us to "stay tuned".......
The site now only asks us to "stay tuned".......