This doesn't happen to me too often but this definitely is an exception:
http://my.msn.com
The why I'm blown away:
The dragable contents with transparent effects
The themability
The gradients
The context menu's
The resizable columns
Luckily most of this disappears in FireFox :)
Anyone have any pointers on how to integrate this kind of stuff in new websites ?
Update: http://www.brainjar.com/dhtml/drag/ seems to explain part of how to do it :)