I had a few problems trying to get the Mephisto trunk to run with the current edge Rails, my “few problems” really just being unable to run rake db:bootstrap without getting a wrong number of arguments (1 for 0) error. After trying a few things, it looked like my problems were rooted in old rubygems and rake versions, upgrading both allowed me to bootstrap just fine. Figured I’d throw this out there incase anyone else was having problems.