I recently installed Windows 7 and the moment that playerlist pops up and you click it, you know something is fixed. For Vista users you're used to an annoying error "beep" sound going off everytime you click anything on the playerlist. That's gone in Windows 7.
On Vista, if you have the Aero theme enabled (where the taskbar, start menu, and windows have a transparency effect, preview mode when you put your mouse over something in the taskbar, etc) your screenshots with alt + 2 will come out blank. On Windows 7 this is fixed, even while using the aero theme.
There are no performance issues, but then again I am running on a high end system so it's hard to tell. I guess Microsoft gave Graal a break this time,
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Fixes:
-Annoying beeping sounds when clicking on anything in the playerlist.
-Blank screenshots due to aero theme.