Holy cow, I wrote a book!
alexx is looking for a
keyboard-only equivalent to the ctrl+click trick I mentioned a few days ago.
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
(Users with multiple monitors can
couple this with Win+Shift+Left and Win+Shift+Right.)