I've been working on some tutorial docs for using Freefall. There is a usage tutorial that describes all of the different commands you can use with the command line tool. There is also an app development tutorial which walks you through developing a simple leaderboard service. By the end of the tutorial you should have a leaderboard up and running on Google App Engine!
If you go through the tutorial, please let me know how it goes. Any feedback on the documentation would be helpful as I want this to be a tool which people can actually use.