Google has really made an impact on the software horizon that the Internet has to offer.  They have a whole area on Google called 
Google Labs.  Most of their software is geared towards the Windows majority of the population, but every once in a while they have a very nice app for the Mac.  Sketchup is one of those apps, a Mac 3D modeling program, in both a free and commercial version.  Worth looking into for the FREE price, and upgrade if you decide to stay with Sketchup.
