I just got this e-mail from Autodesk - Many of their programs are being offered with free 13 month licenses for educational use. All you need is to register with a valid, school e-mail address and you will get access to many of their programs including AutoCAD Electrical, Mechanical, Civil, Map 3D, and MEP. You can also get Inventor, Ecotect, Impression, and MotionBuilder.

Anyway, here is the link: http://students4.autodesk.com/