I failed to mention that I also installed Mac OS X 10.5 “Leopard” (yes, the full, official name) on my work MacBook Pro this weekend. In addition to its reflective dock, transparent menu bar (why, God, why?), and impressive new Finder view, it’s got quite a sense of humor. Check out the icon for my Windows desktop machine as seen in the Finder:

The Windows 9x-era BSOD is a clever way to avoid having to license the Windows logo artwork. Also note the beige CRT (and yes, I own more of those than I care to admit, but the machine in question sports a Dell 20″ widescreen LCD, for the record ;) ). A few years ago I would have been screaming about militant Apple elitism, but this is too funny to ignore (and to get mad at).
As for Leopard itself, it runs pretty well. There are a few bugs with AirPort that need to be squashed, though — I do like to be able to log on to my wireless network after I resume. The frame rate of the Dock could also use a little optimization, but it IS doing a lot more than it used to.
My favorite feature, though, is Spaces — yes, I have multiple desktops on the Mac now, as I would as if I were using pretty much any modern window manager on Linux. I love having the ability to shuffle applications around accordingly between the desktops. The only improvement I could possibly see with Spaces is perhaps better Expose integration, but I’m not going to complain too much. Leopard’s a good release, but it’s good advice to hang on for 10.5.1 (or 10.5.2 for that matter).