Thanks for all of your suggestions. One source that you did not mention, I'd like to share: Olympia Press
http://www.olympia-press.co.uk/home.htm

Their books tend to be pricy, even if you download, but authors such as Ian Smith are particularly enjoyable.

Anyone know of Web sites that deal in modern slavery: so far the ones I've found on yahoo are more geared toward gays then heterosexuals