I'm not quite sure what I feel about the new iLife-style Finder yet, but everything else, I love. xCode is absolutely beautiful; I don't need Perforce's p4v anymore, since it has Perforce integration!
I like the new look/feel of Aqua slightly better too. Quartz is also a bit faster; the OpenGL has been improved a bit. It's just... mmm. Happy happy.
Now I need a Mac desktop box. My Windows box feels clunky!