I have 1 loop documented. It's a 150 mile rip through Montgomery, Howard, Carroll, and Frederick counties. You can find directions here. (It works best if you print it out Landscape. I'm still working on formatting.) 

Here are the first three turns of George's Annapolis Loop. (incomplete)

A copy of Diesel's wild ride can be found here. I will format it in a similar fashion to my loop, eventually.