For those of you who have just a bit of an ornery streak or would simply like to take a half hour to "fight back," you might check out the Artists Against 419 site. The link is for a subweb, 5th Flash Mob, their "action" site for this month. The goal is to steal bandwidth, send email complaints, and generally be disruptive to 53 known "Nigerian Scam" or 419 sites.
I found using Crazy Browser, which has tabbed windows, was very effective for going straight across a series of sites, hitting refresh, and repeating it. Three sites went down during my half hour (and gave me a really big grin).
As far as I can tell, about half of the sites are currently down for having exceeded their bandwidth. None of the emails I attempted to send got through -- all of those email addresses have been inactivated or have exceeded bandwidth.