I keep returning to Trimble Sketchup after months away from it and forget the basics. I found these three tutorials roll a lot of really useful technique into a concise presentation, that you can follow along with easily. These three take about an hour to get through.
http://www.youtube.com/watch?v=R44Zd892Gro&list=PLB8779E2B3B4291FC (http://www.youtube.com/watch?v=R44Zd892Gro&list=PLB8779E2B3B4291FC)
http://www.youtube.com/watch?v=qG2V4lLkmUY (http://www.youtube.com/watch?v=qG2V4lLkmUY)
http://www.youtube.com/watch?v=30U-tkD4JZY (http://www.youtube.com/watch?v=30U-tkD4JZY)
If you know of other good Sketchup tutorials, consider linking to them here.