Here's an interesting program I found while trying to figure out why the motor enable wouldn't work in Mach3 (bad cable). It shows the pins on you parallel port and whether their high or low. Seems to be a pretty handy.
Here's the blog post I found it at: 4 Axis Stepper motor driver
The link to download it is pretty close to the end, under the red "Foamworks setup" heading.