Google Maps and gCensus

Google maps is an amazing resource: double click on the area you're interested in to select it (ie. center it) and use the slide or the plus/minus icons to zoom to the desired level of detail. To look at adjacent areas, just drag the map the way you would a paper map across a table top! Jimmy Palmer's gcensus.com has taken the Google map technology a step further and added U.S. Census data, all the way down to the block level.