An old friend of Blokus, Sjoerd Mayer, made this amazing program for saving and replaying blokus games. You can play out the moves in a game, save the game, and then go forward and backward looking at the moves individually. As a tool for saving games, it is the best around. As a tool for learning blokus, it is invaluable. When I was a beginner I spent a lot of time going through old games on this program step by step, trying to understand why the experts made the moves they did.
The program should be pretty straight forward to use, but please feel free to send me a message if you need help using it.
There are a number of old .blk files (compatible with this program) floating around, but there is only one included with this download. Try asking around online to see if people have some others. The one file provided is of a tournament final from the early days of Blokus, and takes place between two of the very best players at the time: teta and Phl1.
I will also be using this program to help with future information I post here, especially from the Live Commentary section.
You can download the file here. (This link: http://dl.dropbox.com/u/27727822/Meyer%20Program/MeyerBlokusProgram.zip)