Very little information about this one, it's too new.
Asus EEE Mini PC Laptop and you can get it with XP.
What a kick ass idea. No hard drive, it's all flash memory based which means no shock issues when being bounced around. Has USB connections, wifi, and flash card reader. With the USB connections you can hook up all kinds of stuff, even external hard drives when you are at home for more storage. I've read that the screen is not very bright or good in sunlight though.... UGH!! This is very subjective though. What one person might think is bad, another may think is very acceptable.
I can see getting this little sucker and hooking up a Delorme Earthmate GPS and being able to use Delorme mapping software which is by far the best desktop mapping software ever.
If you don't like touchpads, you can plug in one of these to have a mouse for any conditions.
Will have to work out the mounting issues though, but it's so light that it shouldn't be very difficult. Would not recommend having the lid open during any severe off road use, but who knows until somebody tries it.
Can you imagine having a 9" screen with the full Delorme suite at your disposal? AWESOME!!!!!!!!!