Now this is cool... http://maps.google.com/ now has a new "Satellite" feature.
I already liked the neat overview map they that showed your driving directions from point A to point B, but now you can get a satellite photo view instead of a computer rendered map. That's cool because you can zoom in to your destination and note some landmarks near point B.
I was already considering using Google Maps as my default mapping engine (I am quite fond of MapQuest as well), but now I am truly sold.
For someone else's take (they were also impressed), see this page.