Really like these two:

[video=youtube;dilu1PprWp0]http://www.youtube.com/watch?v=dilu1PprWp0[/video]

Allows a 3D look to open files, folders and webpages, free and you can just put it into your start menu, works on W2K as well

And

Rocketdock:

http://rocketdock.com/

[video=youtube;HlX38hoXog0]http://www.youtube.com/watch?v=HlX38hoXog0[/video]

[video=youtube;Ri69dmfBUWk]http://www.youtube.com/watch?v=Ri69dmfBUWk&feature=related[/video]

Now of course this is just the latest attempt to make Windows look like an Apple OS, but they are free and quite effective.