Here are some technical details for the hardcore nerds:
Built with Ruby on Merb
This site and many of the tools we used to massage the data were written in Ruby 1.8. We heart Ruby.
Our trip planner, named Iroquois, is completely home grown and written in first-born sacrificing C. Built to support Iroquois is our custom memory based data store, MySQL proved too slow. The transit data was built and is maintained by our own hands and the street data comes from OpenStreetMap project.
All the rich UI effects and enhancements are either core jQuery (1.4.2) or based on it in some way, with the exception of the Google Maps components.
The headers are various families of Helvetica (if you have one), FreeSans, or Arial. All paragraph text is either Arial or your default sans-serif.