AutoCAD....

Downloaded student version of AutoCAD for Mac last night.

http://students.autodesk.com/

A decision of good and badness...
Good:
Makes designing and planning the buildings and other models easier and more tidy
Not too hard to learn to use (if you can find the tutorials)

Bad:
Soooooo many buttons
Haven't found a decent tutorial yet
Still need to know what the buildings going to look like in the first place....