In addition to what Ross has mentioned, the folks at @Last (makers of SU5) have an "Alpha" version of a plugin for SU which will enable simple 3D structures to be swapped back and forth between SU5 and Google Earth.
I was able to place a 3D version of my house precisely onto the Google Globe.
I you want further details go to:
http://www.sketchup.com/index.php?id=408
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