Using your mac without the mouse
smartic.us
smartic.us
Among other things, you can define a grid on your screen and move/resize windows in to a given grid slot with keyboard shortcuts.
You notice how inefficient the mouse is for moving/resizing windows after using this. The effect is somewhat like xmonad on Linux, but less strict.
You can see a little demo here: http://www.youtube.com/watch?v=z3ZrUMzBoPI
(note that I changed ESC to focus to Ctrl+ESC in the latest revision)
I haven't packaged it as extension yet, so you'll have to install the original one first https://chrome.google.com/extensions/detail/jdfpnijdiejbheba... then cd into the folder with this extension and pull changes from my fork: http://github.com/dchest/keyboard-navigation-for-chrome