It's definately doable - but since I was going to attempt wireless ethernet in my car, I hadn't worked on it :-p I'll try something later on though.. It should be doable doing a simple grep of the powersource (as mentioned above in hugo's post) and an even simpler if/then statement..
-mark

MK2: 36gb
Tivo: 90gb
CPU: 120gb
...I think drive manufacturers love me!