Many months ago, I had several people ask me to post my transit concept maps for DC online. After those months of procrastination, not to mention adding a few more maps to the pile, I've gotten around to it and created a Flickr set.
The set will become a repository for the maps I create showing various transit concepts in the DC area, including my proposal for around Mark Center:
Or potential streetcar corridors:
There's also my oft-mentioned proposal to extend the Yellow Line to (and beyond) Fort Belvoir:
Lastly, there's been a lot of talk about a separated Blue Line through DC (with a separated Yellow Line thrown in for good measure):
More maps will be posted to the Flickr set as they're created.