Demo Titles for Windows 8?

Hi all. I'm in the position where I'm going to have to show off Windows 8 to some teachers in the next couple of weeks, give them a little hands on time probably, and I was wondering if you all had any recommendations on apps that could show off Metro to its best effect, ideally free or at least very cheap apps. Teachers will probably be of all grade levels. Right now, I've downloaded Kindle for reading, Wikipedia, the NASA: Be a Martian app, and of course there's the normal stuff that's bundled with Windows in general, plus the usual stuff like Mail, Twitter, Weather, Office and I think NextGen Reader is particularly appealing.

Any other recommendations for things to show off the interface? I know that good apps are still pretty sparse in the store, still, and these are not things I would normally be looking for nor using.