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I had this on XP but the sidebar is starting to be a fun tool to use on Vista.
http://www.pandora.com/on-windowsgadget
How to get it to work on 64-bit Vista.
Running Flash-dependent gadgets on 64-bit Vista.
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Because Adobe does not provide a 64-bit plugin for their Flash player, gadgets that require Flash (such as Pandora) will not operate on 64-bit Vista. Recently, someone pointed me to a post on The Average Gamer detailing how to automatically launch the 32-bit Sidebar instead of the 64-bit one automatically every time you log in. Here's how to do it:
* In the System Tray right-click on the Sidebar icon and select Properties
* Uncheck the "Start Sidebar when Windows starts" option
* Go to C:\Program Files (x86)\Windows Sidebar
* Drag and hold Sidebar.exe over the start orb
* Then drag and hold it over All Programs
* And again (drag and hold) over startup
* Now drop it into startup