I LOVE windows 7. No joke. It is fast, smooth, good looking yet still functional.
My favorite parts have been just discovering things. I don't think they were in vista. For instance, on the start bar, there is a toolbar you can add into it that will let you type in an address and it will open an explorer window there, saving a little time.
The start bar is a little bigger, taking up the entirety of the Vista style start button. The Setup for it though is very different. For instance, it is pure graphics, showing an icon for running programs, rather than the text of its name. When you have multiple ones open, by clicking on the icon, there are mini windows that pop up just above it showing each window of the program that is open. You can choose to close each from there or select one to look at.
All in all, I have enjoyed using windows 7 immensely. I have been using it since January with no problems (had a little hiccup in beta but worked around it). A+ . If you are running vista right now, I would STRONGLY suggest getting the Windows 7 Release Candidate free download to hold you over till the October 22 release date.
There are some other cool features, like slide show wallpapers, the window style, and some other misc things here and there, but those that I listed are probably the better aspects.
Great Quote:
"Time...LINE??? Time isn't made out of lines...it is made out of circles. That is why clocks are round!" -Caboose