As the title says, it's an Alt-Tab replacement that makes use of a Listview to display running programs along with their window icons (many thanks to shimanov for figuring out how to retrieve the icons!).
See my latest post(s) for replies to comments, etc.
I've uploaded the script to AutoHotkey.net as it's getting too long for a forum post ;-)
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LATEST VERSION CHANGES:
FIX: Some windows weren't shown in the list.
FIX: Group/tab related bugs
+: Groups of windows are shown in tabs - they can be re-arranged by drag-and-drop.
+: Settings tab.
+ & FIX: Updates to the listview colour code - much smoother now (thanks to ambi for updating the Listview script).
+ & FIX: Sorting of columns with direction indication ([+] or [-])
+: Mouse wheel over the TASKBAR scrolls the list - Middle button SELECTS a window in this mode (it normally CLOSES a window!).
+: Save data on big changes (in addition to program exit) - e.g. new group created, hotkeys changed
CHANGE: Selections with the mouse are now made with a double click (or just release the Alt key) instead of a single one.
CHANGE: Adjusted display position to be centered by default.
CHANGE: Dialog windows only indicated by red higlight (not by title too).
CHANGE: Not Responding windows indicated in a new column (not by title).
CHANGE: Many speed optimisations and code improvements (it's almost decipherable now ;-))
FIX: Handling of "Not Responding" windows with no delays.