We are all used to Google Maps, Yahoo Maps or even just your phone or car GPS. I highly recommend something I found to be much more of use when visiting the DC area. Washington DC has a tourist site for an Interactive Map that helps users find restaurants, transportation, local events and of course all your favorite museums and monuments. I was referred this source by a Washingtonian Native actually who still uses it to get around for a night on the town.
American Guest House in Washington DC