So I have been using Vista for some time now on both my laptop and desktop and I have been getting to like it quite a bit, I mean it was very much like the switch from Windows 2000 to Windows XP, my initial thoughts were that it was just a nicer looking operating system.
After a few weeks I started to get to like some of the new features both aesthetically and more importantly user ability.
The one thing I noticed and liked initially was the Alt + Tab now called the Windows Flip.
Windows Flip is an updated Alt + Tab feature that now, with Windows Aero shows you live thumbnails of your open windows instead of generic icons, making it easier to identify the window you are looking for.
The next thing I noticed was when I hovered over the taskbar thumbnails, I was presented with a live thumbnail of a minimised or a window that is in the background.

The the last thing I noticed by accident was when I thought I was pressing Alt + Tab but instead I was pressing the Windows Key + Tab brought up the Windows Flip 3D. What this does is it creates a view of all your open windows in three-dimensional stack on your desktop. you can then scroll though that to and quickly locate the window you are looking for.
