Beta PowerToy options:

Background Switcher (bgswitch.zip)
Adds a slideshow tab to Display Properties and allows automatically changing the desktop wallpaper periodically.

Internet Explorer Find Bar (iefind.zip)
Adds a toolbar to Internet Explorer 6 that allows users to search for keywords in a web page.

ISO Image Burner (isoburn.zip)
Burns ISO images to an Optical disc recorder.

Shell Player (shplayer.zip)
Windows Media Player-based compact player, which allows playing music from the taskbar.

Super-Fast User Switcher (fast.zip)
When using the regular Fast User Switching you must first go back to the Logon screen to switch to another user but with this PowerToy you can switch users without having to go back there. You simply press and hold the Windows key and then press the Q key to cycle through available users. When the desired user tile is showing on the screen release the Windows key to switch to this user.
Note: You cannot use this toy unless you are on a workgroup and you have Fast User Switching enabled.