Another source of international trade info is International Trade Web Resources
To see a comprehensive list of Nigerian scammer pseudonyms along with banking info.
The 419 Coalition - One of the earliest privately run awareness sites.
Greater Things:A numerological perspective of the 419 fraud from a religious point of view.
Others from Lagos section of the Scamorama site.
Swedish 419 Info.
Tanko Zuba - has taken the time to investigate the claims cited in letters.
Internet Fraud's Nigerian Scams section. Lots of documentation images.
FreemanInstitute - Anatomy of 419 fraud.