Autodesk 123D

The free CAD program space is really bad. There are some decent programs out there, but none of them offer the intuitive interfaces that Autodesk, PTC, SolidEdge, and Siemens provide. I haven't tried this yet, but I really hope it provides the kind of tools that allow hobbyists to do real parametric modeling. I'm kind of pumped about this product...I'll let you know.

Check it out here!