References:

Download Qbasic and sample programs: here
(make sure you get both the .exe and the .hlp files)

Electronic Control of a Stepper Motor -- one way to run a stepper using logic chips
Stepping Sequences for a Four-Phase Unipolar Permanent Magnet Stepper Motor -- nice explanation and animations of stepping sequences
CNC Retro-Fit -- one of the best and most extensive resources for links on steppers, software, and CNC
CCNC Home Page -- inexpensive do-it-youself CNC