Snipping Tool. Yeah, we could already do that with Ctrl-PrintScreen and Paint, but it's nice to have it all in one tool.
7 is a noticeably more responsive than Vista.
No text next to taskbar buttons by default. I really don't know the icons for a lot of apps I use.
moving a window to the top of the screen maximizes it. It would be nice if I could hold down a key or something to override this as sometimes I just want to move the window to the top of the screen.
I like the drag to maximize, but I like being able to drag an already maximized window to restore it even better. Its great when I want to peek behind the window to not have to double click then go find the title bar to drag. I can do it all and put it back
in one motion.