Very nice. Clean, easy to read. Very healthy aesthetics.
Question: why have you chosen to make your menu collapsable? (Not that i disagree with the choice, but I always like hearing people explain their rational.)
I didn’t really make the sidebar collapsable. I made it expandable.
In the site’s original conception, I decided on a very simple, single-column layout until the content grew. Since the idea of one column was non-typical, I thought I’d leave it as the default and then add a seperate stylesheet.