Schmap makes interactive map/tour-book hybrid guides that you can reach on the web or download to your computer or iphone. You can click on map-points to see places of interest (with photos solicited from local Flickr photographers), directions, and information.
The D.C. edition seems like a great choice for those going out on “local tourism” adventures, but trying to keep touristy image to a minimum.
Many editions exist for cities around the world and all are available for free. An updated version of the Washington guide will be published mid-August.