Taskbar Shuffle Gadget is a plugin for Google Desktop that lets you rearrange your Windows taskbar buttons by simply dragging and dropping them. It also includes some nifty features to better control taskbar button grouping in Windows XP.
You must have the Google Desktop installed to use this plugin.
Features include:
August 13, 2006 (date released)
download Taskbar Shuffle Gadget (v1.0)
528kb, WinXP/2000/NT compatible, FREE
First be sure to have Google Desktop installed. Then download and install TS Gadget from the link above. Here's what the gadget looks like:

-Check the first box to enable dragging of your taskbar buttons
-Check the second box to be able and close a button or group with a middle mouse click (like Firefox tabs)
-The grouping options will control and tweak the taskbar grouping that's available in Windows XP. If you are running Win2000/NT, these options are not available.
Removing the gadget is a two-step process:
1) Remove the gadget from Google Desktop.

2) In Windows, go to Control Panel > Add/Remove Programs and remove the "Taskbar Shuffle Gadget v1.0" entry
Q: I've installed the gadget and it's not/stopped working
A: Few things that can cause this...
Q: I have Taskbar Shuffle (desktop) installed, will this interfere?
A: You can't have Taskbar Shuffle (desktop) running while using this gadget. Either shut it down temporarily, or uninstall it if you end up liking the gadget better.