This looks great, good job! A couple of things:

1. I renamed the default FLOOBITS_README.md to teach.py, but the path at the top of the page still showed the README filename. teach.py showed up in the left nav, so I don't really know what was going on there.

2. When I was loading one of the workspaces under https://floobits.com/u/ggreer, clicking on the files in the left nav took really long to load, about 8-10 seconds. I almost thought that all the files were blank at first and were there just to show the nested directory structure.

Apart from that, I think this is really cool! I'm definitely going to be using it over the next few days.