Thought I'd tag this on the end - just a small modification to axcrusik's grid, just with borders between the windows, I've got a fair amount of screen, and I find a gap between windows gives my eyes a break to the background beyond.

Borders are currently 16px wide - if you want to change it just text replace 16 and 8 with the border width, and half border width, of your choosing, or modify axcrusik's original script.

Also, just thought I'd say - this tool is awesome, not sure how I survived without it! I use it with VirtuaWin to give me multiple desktops and I cant tell you how much its helped my workflow, clutter is now a thing of the past, problem is, its now too easy to have too much stuff on the go and sometimes the RAM suffers ;)