Google Earth, More Buildings & More Google Maps
Google Earth, More London 3D buildings
Google Maps in Google Earth
Rotation of Google Maps in Google Earth
Mapperz Source and more useful information: Google Earth Blog
"this is a handy thing worth keeping in your "My Places" and turning on when you need a map-like perspective, but still in 3D. (Tip: you can adjust the transparency by changing the parameter in the network link from &TRANS=80 to 100 - no transparency, 0 - fully transparent)"
Mapperz agrees very worthy of 'My Places' and that a good tip on transparency.
Google Earth is now available for the Apple Mac using OS X 10.3.9+
more information here
Google Earth Download Page