alexx is looking for a keyboard-only equivalent to the ctrl+click trick I mentioned a few days ago.
- Ctrl+Shift+Esc: This opens Task Manager.
- From the Applications tab, use Ctrl+Space to select the two windows you want.
- Alt+W (open the Windows menu)
- V (Tile Vertically)
Not as quick, but it still works. And it works even if the windows you want got converted into a group.
Of course, on Windows 7, you can use the Win+Left and Win+Right hotkeys. (Users with multiple monitors can couple this with Win+Shift+Left and Win+Shift+Right.)