installed Leopard on the day it went out. installed it during lunch, at work
its pretty nifty, i guess they optimized resource handling, since some of my apps seem to run a little bit faster (i.e Poser, and Bibble Pro).
i actually like Spaces, weaned from the Sun-world. and i don't need to pay additional for the virtual desktop functionality, as in previous OS X versions.
Time Machine is a good feature, but I still do Super Duper! M-W-F nothing beats a good external backup on a firewire HD (which supports firewire boot, of course).
all in all i'm having fun with my G4 and Leopard again.