SolidWorks for Dummies
I don't think there are many SolidWorks users (or engineers and designers in general) who are "Dummies", but if you know about this line of books is really helpful in making thinigs simple to understand. And now there is one written about 3D CAD -- SolidWorks for Dummies.
You can get it at Amazon for under $20 bucks, and the book includes a free demo CD with videos about SolidWorks.
www.solidworks.com/dummies