Now, along with "map" and "satellite" views, you'll find a "hybrid" view that overlays map data (street names for example) on top of satellite/aerial imagery. Hybrid view is available for the US, Canada, UK, and Japan.
Cool and very useful. However, it's far from a new idea on the web. TerraFly has been offering street names and other info overlayed on to satellite/aerial imagery (US only) for many years. As I point out in this post, TerraFly not only provides aerial imagery but also offers an amazing amount of local info by simply clicking on any image. It's also cool and very useful.