One map in particular that caught my eye was an example spider map they did for the 16th St. Mission BART station:
(click to enlarge)
It's based on a series of maps that CHK America, Inc.* produced for Transport for London. Spider maps are schematic maps of all the bus lines serving a transit hub, radiating out from a street map of that neighborhood showing where the bus stops are. It makes it easy to see exactly where to find your bus, and how many stops it is to your destination. Click on the examples to get a better idea of what I mean.
Here's an example for Piccadilly Circus:
(click for full-sized PDF)
Greater Greater Washington, a blog that often covers transit, has a post about spider maps:
I'd love to see one of these done for some of the big transit hubs around Boston, like Harvard Square, just as a proof of concept, like the one for 16th St. Mission.
*CHK America, Inc. has a number of fine examples of their work at that link. I have no connection with them except as a user of their products.