Burnout -
Even if Vista was, say 10% faster, it's unlikely that I would install it on this computer, at least, because I have a really nice setup that I'd not like to invest the time to recreate.
Of the features that it includes, I though that the start menu find would be the most useful, but then I found
Lanchy which frankly seems to be an even better idea.
When I look at the set of OS features that I use, it is pretty limited...Alt-Tab, task manager, IIS control panel, and Explorer. All of which I am very comfortable with and don't see any need for change in. Especially Explorer--any changes that take me away from the direct file system interface I'm sure I will resent. Virtual folders? No thanks. I'd like to know where my files actually are, thank you. Metadata? Not if I have to enter it manually. Rankings? I could do that via various MP3 players and never once found it useful. Transparency? I can get transparency in XP and I find it useful in only very limited situations.
EDIT - Oh yeah and I also use the command prompt. I haven't heard of any improvements in that.
And if Microsoft thinks that a RTM release a few months before January is enough time to get driver and application compatibility ironed out I want some of whatever they are on. Not gonna happen.
I probably will end up using Vista for testing software but I think it's going to be a while before the killer app shows up and only runs on Vista that convinces me to move over.