I don't think I've mentioned it before, but i have a friend and fellow grad student who studies tattooing, both in 'traditional' cultures and modern.
He's a great guy and throws great parties too...(and his wife designs lingerie...how lucky can you get??)
Anyway, here's his website
http://www.vanishingtattoo.com/lars_krutak.htm
It has lots of articles about tattooing in different indigenous cultures.
Thought y'all might enjoy some of his stuff.