I also read on the internet somewhere about a "Crystal task/sidebar" easter egg, Microsoft left in the 4074 (WinHEC) build.
Essentially, the site said you have to go to:
HKEY_LOCAL_MACHINE>SOFTWARE>MICROSOFT>WINDOWS>CURRENTVERSION>EXPLORER
and create a DWORD named "MILExplorer" and value 1.
It would enable partial glass effects. Then you have to execute a commandline for runddl.
The screenshots looked great on the site. I had Longhorn installed on VPC, and tried it and ended up in a reboot cycle that resembled perpetual motion.

Haven't tried anything after that. Longhorn is unstable as it is without a geek pulling wires and whacking it with a hammer. My new resolution is to patiently wait for a beta (or until I get better instructions to enable the effects)
