Despite being a happy Ubuntu user, I installed Vista last week (for free, courtesy of the UA) on a spare hard drive. I have no desire whatsoever to use it, but it seemed that having a general awareness couldn’t hurt any more than using Lotus Notes on a daily basis does.
I still haven’t used it much, but I have to admit: Vista is pretty. It’s very pretty. And as I said to Cody when he asked for my initial impression, Vista may just out-pretty OS X, but it’s like getting smacked in the face by a really, really beautiful fish.
In fact, it’s so in-your-face pretty that it’s incredibly distracting and unnecessarily CPU/GPU-intensive. The flashy UI adornments don’t give you extra information to help you get your work done; they jump out at you like a 14-year-old attention-whore, screaming “Look at me! I’m so pretty!*”
I stick with my long-standing assertion that OS X tends to get out of your way and let you do what you need to do, where Windows trips you up and expects you to figure it out. And Linux – well, if you don’t like it, hack up obscure config files ’till you do.

Aero Glass/Cataracts interface
* Please enjoy the short version, too. I love these commercials, and they make about as much sense as some of Vista’s prettiness.