Free version of CoCreate CAD Software

On http://www.cocreate.com/free you can register for a free version of the CoCreate CAD Modeling software (Windows XP or 2000 only). This is a limited version of the commercial software, but almost fully functional. It has a limited amount of parts (60 unique ones per assembly -- is that too little in regular use?) and a non-compatible file format.

In contrast with applications such as SolidWorks or Inventor, it uses a non-history based modeling approach, which makes it conceptually quite different to use. It might work for you or not...