http://www.drayconstruction.com/foamstuffs/  Plans for low-cost CNC foam cutter.

http://www.geocities.com/crankorgan/  Plans for interesting projects by John C Kleinbauer.  Includes a simple CNC machine (SP-3 compatible) that would make an excellent class project!

http://www.kellyware.com Shareware g-Code software KCAM, compatible with SP3/FET3/FET4.

http://www.cs.uiowa.edu/~jones/step/ For an excellent treatise on Stepper Motors, visit 'Control of Stepping Motors, a tutorial' by Douglas W. Jones, also known as 'Jones on Stepping Motors.'

http://www.metalworking.com/shareware.html Free software and links related to machining.