For safety, I made sure both computers were plugged into the same wall outlet -- so they share a common ground. I know some of the long distance network adaptors are isolated, but with a simple printer cable you are tying the circuitry of one mac into the other.

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Is this something one should be concerned about? If so i'll plug my Mac's into different power strips.

Okay,

I plugged my serial cable between the two printer ports on my Macs and no luck getting them to see each other (using Chooser > Appletalk).

I didn't have time to play w/ this more, but should I be using the ethernet ports instead of the printer ports? Will a 8-pin serial cable (like I am using) not work?