Love the simplicity, and it looks like this could serve as a great example for people wanting to write their own WM.

Might I suggest adding a link to a screenshot directly in the README? I personally have a weird fascination with window managers so I'm likely to check this out regardless, but a screenshot could go a long way in terms of generating interest. If you care about that sort of thing. :)

I see you have a minimalist IRC client as well. Funny, I've been meaning to get back into C specifically to toy around with the idea of writing my own WM and IRC client. Both projects look like great examples, thanks for sharing!