sketchup

If you are a current or potential user of Google SketchUp then I would recommend checking out the SketchUp Show. It is a regular video podcast that goes through how to use the various pieces of functionality avaiable in the free modeller. The production quality of the tutorials is very high and they go through at a pace that is easy to follow along with. Because these are video podcasts they are not small downloads (about 100meg each) so do not try attempting to download them via a dial-up connection unless you can wait a few days.