http://students.autodesk.com/

A free networking site for students in the fields of architecture,
design, civil, and mechanical engineering. Members are able to download student editions of Autodesk software, find jobs, discuss projects, share work, learn from community experts, and make new friends.
Free software:
Autodesk Civil 3D 2006
Autodesk Civil 3D 2007
Autodesk Inventor Professional 10
Autodesk Inventor Professional 11
Autodesk Raster Design 2006
Autodesk Raster Design 2007
Autodesk Revit Building 9
Autodesk Revit Building Series 8.1
Autodesk VIZ 2006
Autodesk VIZ 2007

The software includes a one year student edition license

I'm excited because Autodesk VIZ is basically 3D Studio Max with less powerful animation features