I wasn't sure what forum to put this in, so I figure I will start here and if it needs moved I can move it.
After getting Windows 7 x64 installed, I was having a problem getting the Pandora Gadget to work. It turns out this gadget uses Flash, which only comes in a 32 bit version. The Sidebar is x64, and can't access Flash. I came up with a quick and dirty way to load the 32 bit sidebar instead which allows flash to work! I know there are several gadgets out there that use flash so this should be a fix for all of them.
Edit the following Registry Key: \\HKCU\Software\Microsoft\Windows\CurrentVersion\Run\SideBar
Change the key to this: C:\Program Files (x86)\Windows Sidebar\sidebar.exe /autoRun
(The only addition is loading sidebar.exe from c:\program files (x86)\ instead of c:\program files\)
This should get you by until Adobe gets their act together!