Google just upped the ante again with Google Satellite. Satellite images curtsey of Digital Globe and EarthSat.
As a side-note, the Google Maps URL includes GPS coordinates, so given a street address you can get both GPS coords and satellite map quickly and easily. You can also just erase the part from q=Blah+blah& part of the URL to get a nice clean satelite image, or just add &t=k to an existing Google Maps URL to turn it into a satellite image. (I really hope that doesn’t become an issue for some well-meaning panic-stricken patriot who thinks terrorists couldn’t get that info quickly and easily in dozens of other ways — I always missed that GPS feature when it was taken out of earlier mapping software.)
Update 7:40pm: Note that you need to click on “Link to this page” in the upper right-hand corner to get the full URL to show up in the address bar.