When you run Vista higher unless you have a powerful graphics card it doesn't like it right now.. probably going to change.
Finally got an update in Vista a few days back so applications open the same speed as Windows XP (which is a step-up from before heh)
Design guides and such for Vista right now dont' have enough images imo... I mean they're interesting to read, but none seem to want to show you visually what to do, or if they do it's at a pathetically small thumbnail without a fullscreen version.
This is a shame given how much more Avalon provides to the UI System.