You can do that already (at least in XP, dunno about Vista/7).
Open your chat windows and select the first chat window in the taskbar. Then CTRL+click all other chat windows in the taskbar, right-click on the last one and select "tile vertically". Or, if you've got more than 8 (?) chat windows open it should auto-group them and you can just click "tile vertially" right away..
This post was edited on 09-26-2009 at 10:26 AM by andrey.
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