Those are the first generation 701's. They arent good value for money. They have a 7" screen and a paltry 800mhz CPU.
The 901's were the first to bring in the Intel Atom chipset - Dual core 1.6ghz with integrated 945 chipset for video (it complies with vista's rendering standards). The 901's also have more battery life and a 9" screen, and some versions are coming out soon with integrated HSDPA (Next G data) modems built into them.
Krishy, it wouldn't work nicely for AV, esp not in the glovebox - if you want to do that, a carputer is still the best option, esp if you get it with an in-dash touchscreen.... EEE's are great for what they are, but they still have undersized keyboards which give most people hassles, and I'm sorry to say that the trackpad isnt great either - which was the main reason I bought the bluetooth mouse...
They also have the ability to run the EEE-TV usb DVT-B digital tuner - I've got one and it works great, provided you're in range and have a decent antenna...
Personally, I wouldn't buy anything without the Intel Atom chipset... the 901 isnt slow, but you wouldnt want to go much slower - esp if you don't intend on replacing the secondary SSD with a faster replacement.
-D