Context Tree Weighting (CTW) has been a technique with great promise, but it hasn’t ever been able to reach the critical mass needed to become more than a curiousity. Jürgen Abel is doing his best to overcome that problem. He’s created a nice reference page for CTW on his data-compression.info web site. He has references to a few papers, a few people, and one piece of source code.

http://www.data-compression.info/Algorithms/CTW/