How to CAD? Where to learn?

I found the emachineshop tutorials very good and easy to follow when I dived into CAD a couple months ago. The Alibre tuts aren't as easy to follow, but the software is pretty easy to use atleast.

I think the main limitation of the Express version is the limitation of 10 parts per assembly. If you're just making single parts or small assemblies, you can probably get by with the free version forever.