For starters: put some fscking RAM in it! With 1GB my Mac Mini runs just fine with Leopard! You've probably got the stock 256MB, right?
EDIT: as nine3o said: add a faster hard drive. I did the 7200 RPM hookup as well. Of course if you have cash there's always SSD...
For afterwards: stick with it for MorphOS. It must be really sweet on the Mini (from what I've seen and read)! And you surely ain't going to find another such small and nice device to run MorphOS other than the Mac Mini.
For last: throw it my way if you're gonna throw it, as the previous poster said. It'll take real good care of it! :-) And one more hint: make a "carputer" out of it. It can easily fit in a car and provide all the entertainment you'd want OR setup FrontRow on it and use it in your living room. It's an awesome media box!
