Ruby on Rails

I'm also looking at Ruby on Rails as a web development platform. I've been using .NET for years now and I'm very happy with it but I don't feel any compulsion to move to .NET 2.0 and learning a new set of technologies could kickstart my interest in programming again, which has waned a little recently. Rewriting Mentor using RoR (and MySQL) would be a big job but it might save a lot of money in the long run (£600 a month for a dedicated Windows 2003 Server for a start). RoR runs on OS X, so that would mean I wouldn't need Windows at all. Still, I need to put a fair amount of effort into learning it all first before I make any decisions.