A big blast of amazing tools announced at MacWorld San Francisco this week. Intel Macs and iPod radio -- but I found out about this on the MAKE Expo blog:
The Acropolis as a SketchUp 3D model laid on and into Google Earth
MAKE's "Best of Macworld SF 2006"
Google Earth for Mac OS X
SketchUp Google Earth Plugin
3D worlds! Yay!