Yeah, I admit it, I upgraded recently. I decided it was better to get it over with than have it forced on me when I eventually have to replace my laptop.
That out of the way, some things that annoy me about vista:
The lack of the classic Storm theme. I loved that theme

The lack of an ability to modify file types without using third party tools or the registry editor. Don't get me wrong, I understand why they removed this considering how many times I had to help people fix their computers after managing to associate .exe files with notepad while trying to change the default icon for JPG files (yeah, don't ask...)
The start menu of doom: Yeah, this is special. If you haven't had the displeasure of having to use it yet, take the XP start menu and bastardize it so that instead of opening a new pane for all programs it changes the Pinned/Recent programs pane. Yes folks, that is the new vista start menu.
I'll update this topic as I find more things that annoy me about it.