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ActivateByNum: Win7 taskswitch — Description
Description
ActivateByNum enables Windows 7 task-switching hotkeys on XP and Vista.

Windows Logo Key +1 switches to the first window on the taskbar and Windows Logo Key +2 the second, etc. (It works with only the first 10 windows.) For a collapsed group of window buttons, repeatedly pressing the same Windows Logo Key +n combination (where n is the position of the group on the taskbar) will cycle through each window in the group.

The source code (AutoHotkey script) is available here .
Supported systems
Windows XP (32-bit), Windows Vista (32-bit and 64-bit)
Other recommended utilities
ActivateByNum works best when used with Taskix or Taskbar Shuffle for rearranging taskbar buttons and Taskbaric for iconizing taskbar buttons.
Update June 6, 2009
Incorporated a few suggestions from ~friele80 :
Numpad keys work now.

The target window will be minimized if it's already active (only for windows not in any collapsed group).

Update June 13, 2009
Windows Logo Key +- shows window numbers (>= 5) as tooltips.