Google is starting to mesh maps with real estate listings. How long will it be until there is an API for this that you can customize and search for properties near transit? Some sites are starting to do this. Perhaps at some point it would be good to mix in the H+T index to see what your monthly transportation bill will be when you buy a house. If you live in a more walkable neighborhood, you can offset the perhaps higher cost of your home with less transportation costs. It's coming, hopefully someone is on the case.
H/T On the Block
Flickr photo by Zoomar