You need massive power supplies for massive notebooks. Werent you advocating carrying an extra 3 pound secondary battery too?
Kidding... hey, I been eyeing a product APC puts out. Its a transformer that plugs both into the wall and 12v car outlet, provides laptop power and a small USB hub that is power only, for PDAs and cell phones, whatnot. Lots of adapters to fit your eq. You just need to figure out your wattage and make sure you arent drawing too much, lest you fry your adapter or worse... The product comes with thier backpack. I like the idea of a central charging solution, since I carry a portable printer as well.
I have this mental pic of dashby shoving bananas
and tin cans down a "mr. fusion" hard wired to his lappy. LOL
Just havin fun dashby