I recently got a new Mac mini to start playing around with Leopard-only software like MacRuby , and moved most of my day-to-day files and programs. The problem is of course that Leopard does not come with Classic, and apps like NCU won’t run.
Fortunately, the RDCL library and tools work quite nicely, and after downloading Ruby 1.9, I was able to get first my address book in vCard format onto the Mac (using IC/VC), as well as some other important notes. There’s still lots to be done in terms of converting data (ink and drawings would be great), but it’s a good start!