I use SizeUp for moving around my windows. It helps to keep terminals, code, browser and web inspector in their particular positions and if something needs focus I can make it maximized.

I use ratpoison for X11 (http://www.nongnu.org/ratpoison/) (1 Full screen program at a time. CTRL+T, # to switch, CTRL+T, w to get a list of running programs.

Wow! I know I've seen things like that in the past. Can you use it with multiple monitors?

Yes. Definitely. Ratpoison has another keybind for switching which monitor is the recipient of window change commands.

SizeUp looks like a paid-for version of https://github.com/fikovnik/ShiftIt .