How is one random user with one specific machine with something working moderated "Informative"? Suspend doesn't work on my Inspiron 6000.... so uh, I cancel you out? Not to mention that the latest Ubuntu boots and responds much slower than either XP or Win7beta on _this_ machine... but one machine tells you nothing doesn't it?

Being 100 years old doesn't have much to do with having a neutral wire or not... what you have going on is switch loops, where a hot leg is sent to the switch, then sent back to the light. Since you're only switching hot, there's no neutral needed... this is valid even in the most recent NEC, so there's no bringing it up to code. Using switch loops is still very much alive today.

Now, snaking a separate wire in the wall to the switch certainly is NOT code and isn't really a good idea... it's better to run a 3 conductor cable (14/3, 12/3, etc) to the switch from the light, use the red & black for the switched leg, and then you have a white wire for the neutral to power the Insteon switch. Cap off the old wires on both ends and be done with it.