A small, fast flash drive is preferable to a big slow
hard drive. I know, because someone at work bought one of the newer EeePCs with a 160Gig drive and it was basically unusable until we swapped in an expensive flash drive as a replacement. Until the extra money was spent on it, my 4G Eee was much
better, even if I do have to manage my use of the system drive very carefully.
Since I'm posting, the AA batteries are a HUGE
advantage. I've refused to buy any digital camera that doesn't take AAs for ages now and the result is that the last three cameras I've bought are all still perfectly usable. Meanwhile, I'm onto the second battery for my Eee (which I effectively got by buying an entire 2G Eee fairly cheap), and my early digital cameras (which I spent quite a bit on) are glorified paperweights. There are some very, very nice rechargeable AA options
out there and some seriously good chargers
. I've invested in some of this stuff and would love to be able to use it with my netbook.