I had problems installing it on older versions of OSX (Leopard), mainly because I was VERY new at managing the command line and understanding the relationships between ruby, rails, gems, etc and all of the various versions. I later got a new MBP and installing from a new install was very straight forward, but having to upgrade everything first and then installing it wasn't fun for a n00b like me. I would be interested in seeing this project as I think it would be easier for new kids on the rails block.