Google Maps has a new view to add to Terrain, Satellite, Map and Traffic. It's called Street View and it provides the view you would have if you walked down the street. You can turn around 360 degrees and walk from block to block. You can zoom in and out too!
Go to http://maps.google.com/ and type in an address. (Unfortunately, not all streets have been photographed yet.) Click the Search Maps button. Then, click the Street View link. Click on the arrows to move down the street.