Apple - Move windows around a desktop -- and to different desktops -- using only the keyboard?
Moving windows to another space:
- SizeUp (still works for me in 10.8)
- Spacey (stopped working in 10.7)
Moving windows to another display:
- Optimal Layout
- Window Mover
There are many, many different sharewares out there that let you move windows around using shortcuts. Just look for window manager in the Mac App Store. I would recommend BetterTouchTool. It's a freeware that let's you customize just about anything. For example here is the shortcuts I have created for myself :