I’m a Mac user.
I picked up a 12" PowerBook G4.
It's a whole different world, using a Mac. I'm still figuring out how to do basic things, but I'm starting to find my way around.
So far I'm really happy with it. It's fast, quiet, and the AirPort wireless is great - better than any other (PC) laptop I've used. The two-finger scrolling on the track pad, which I expected to be mostly a gimmick, works perfectly. I use it constantly.
I don't have any developer tools yet, and I'm not even really sure where to start. One of my goals is to work with Mono - I know MonoDevelop has been made to work on the Mac, and there are C# wrappers for Carbon, so that's going to be one of my first goals.