Google has given the same treatment to SketchUp. Google has released a free version of Google Sketchup (a basic stripped down version of original Sketchup Software) that lets you create detailed 3D models for Google Earth (kmz files) and share them with other Google Earth users using Google 3D Warehouse - an online repository of Sketchup drawings and models accessible from the Sketchup Interface. The 3D drawings can also be printed.
At the same time, Google has released SketchUp Pro 5 which has all the original features of Sketchup like Animations, walk throughs, 3D export formats, sandbox and free tech support. SketchUp Pro users also get access to ruby script support and large-format, high-resolution printing.
Both Google SketchUp and SketchUp Pro 5 (with the plug-in) are Google Earth enabled. SketchUp Pro 5 is approved for commercial use. SketchUp (free) is not. Google has also confirmed that SketchUp Pro Version 6 is in development.
Download Sketchup Google Earth Video Tutorials - Impressive Screencasts done in Camtasia Studio
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Download SketchUp Pro | Google Earth Sketchup Plugin
Visit Sketchup Home | Still waiting for Google to release Measure Map for free | source | Google