I'm worried about creating too many categories though. I'd create education if I could get rid of another category, but they are all active.
You've only used up half of the space for categories. You could, quite easily, add a few more categories without it appearing cluttered and without having to get rid of anything already there. Trust me.
Actually, I have. I've accessed it a few times on my BlackBerry Curve and it appears on a smartphone similar to that of Craigslist. Unfortunately, that doesn't have anything to do with the site categories. It's the format of the site. It just doesn't translate very well to cell phones.
We've got an education section, it's called politics
When I suggested an education category, I was suggesting a category in which we could discuss the institution of education and the latest decisions made by those within the field and how they'll impact education overall.