Check this one out:

"...the map's just an overlay to get you into the site search function.
And what are you searching for, you ask? It's pretty specialized -- the
site's a way of keeping track of anyone in the (non-federal) prison
population whose whereabouts you wish to know. The site's free, and
victims or others who want to know if a particular person's status
changes can sign up for phone or email alerts. For the right person, an
entirely useful site."

http://www.vinelink.com