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For people that love Emacs and Lisp, I would suggest to also take a look at StumpWM. It's implemented in Common Lisp, and you can customize and develop extension on the fly.

Adding another one to the list, I am the maintainer of Qtile, a tiling WM written and configured in python. We've even got an ubuntu ppa, so we're only an apt-get install away :-). http://qtile.org

I installed i3 on my ubuntu laptop and am so used tiling windows now, especially since i3 lets you choose which way new windows will be tiled.