Another post from the Vista customization category. As I read here someone has extracted the Vista mouse cursors from Build 5465 in order to make them available on Windows XP today. The decision to switch to the new cursors after sticking to the 3D cursor set for the last six years (whew) was conceivably an easy one. The direct download is over here.
I've used these two animated "busy" cursors in my old cursor set. If you like them, here's the download.
Update: Marci has created two orange-themed cursor sets based upon the Aero cursors above.