Good start, however Craigslist needs to do a lot more than adding maps. For example, real estate listings need to have transportation options. Part of the reason why we started http://www.realtywarp.com is because renters need more information about a given neighborhood before visiting a listing. Renters tend to have a preference for a specific square or metro. That said, they will not be visiting a listing if they do not have that information immediately available.

Here is an example of what craigslist could be doing with maps and transportation options:

http://boston.craigslist.org/nos/fee/3181869892.html