"Between the Bars is a blogging platform for one out of every 142 Americans---prisoners---that makes it easy to blog on paper, using standard postal mail. It consists of software tools to make it easy to upload PDF scans of letters, crowd-sourced transcriptions of the scanned images, and the usual full-featured blogging tools including comments, tagging, RSS feeds, and notifications for friends and family when new posts are available."
The blog offers profiles of each prison blogger and original content in its original form. Check it out here.
