Installed 2008 yesterday, SP0.1 today.
I hate it already.
Everything is in a different place, and works differently.
There's a whole palette of crap that follows the cursor around. Okay, it's not crap, it's stuff that used to be in other places, and pretty much stayed put ... so you could find it when you needed it. The contents of the palette changes, probably in relation to context, but so far it seems more random than that. Everything is an icon, which will explain its meaning eventually, but waiting for the meaning to appear, or remembering the correct click, is a _lot_ slower than reading a labeled button.
EVERYTHING fades in and out like a damn Cheshire cat.
All of this UI complexity does not come for free. It's noticeably slower.
Mike Halloran
Pembroke Pines, FL, USA