Another great site about the Nigerian scammers;
www.scamorama.com
It's got hundreds of long email transcripts between scammers and the twisted individuals who lure them into long, crazy, extremely funny email exchanges under pseudonyms like James T. Kirk, Bruce Banner, Mikhail Stroganoff, Sir Marmite Luny-Binns, and so on. On one occasion I laughed so hard I lost bowel control.
Also a good site for factual information on the scams -- all the variants, and so on. When people come across a new scam variation, they send it in and it's added to the FAQ.