Fist of all I would like to say NICE WORK!!
Secondly, it would be useful to be able to manipulate the windows via the title bar similar to the actual windows OS'.
(1) Double click on title bar maximises window (or restore's down if already maximised)
(2) Double click on left end of title bar closes window.
Microsoft's implementation of a virtual desktop (mesh.com) provides this functionality and it makes life a little easier