I thought so too, but it actually works (on 10.6 at least). You must only know where the other spaces are located: North, South,East or West. Or you can type F

I thought so too, but it actually works (on 10.6 at least). You must only know where the other spaces are located: North, South,East or West. Or you can type F8 (default) and drag windows between them that way . . .