In car pc

hi,

not sure if this is the right place to post this but oh well. im looking into getting a small laptop/netbook for my car instead of a traditional head unit. But ive got a couple of questions about it:

is it possible to run a laptop off of the cigarette lighter?

ive seen some usb touch screens on ebay which are advertised for the eee pc. do they only work on this or would they work on any computer?

im only going to use it for google maps, music and maybe some dvds. what is the minimum spec that would do this? ive seen a cheap laptop for sale but its only got a 400mhz pentium 2?

theres probably some other questions that ive forgotten, will post them up if i remember

thanks for any help,
raceway99

Yeah im gonna buy a 3g usb dongle (would this require a more powerful processor?)

As for DVDs im still not 100% sure I would actually watch any (maybe in traffic jams?) and if I did the computer wouldnt need to be usable (except for play, pause buttons). so if i decided against DVDs would the p2 be quick enough? also how would the intel atom fare, and im guessing that the gpu isnt really very important.

thanks for your help
raceway99

firstly a big thank you to frozenlead

milkdrop looks pretty cool but it would probably just distract me while driving

if/when i get round to this i'll make a thread in the homebuilds section, would be more interesting then the usual gaming boxes.

again cheers for your help
raceway99