Ken Strutin (JD, MLS), the author of The Insider's Guide: Criminal Justice Resources on the Internet, posted an incredible listing of resources about prisons, the people who occupy them, legal and social services for inmates and their families, issues related to incarceration and reentry, and human rights behind bars. The focus of his listing is on selected web resources and online publications.
LLRX.com - Criminal Justice Resources: Prisoners' Rights and Resources on the Web