One thing that I wish my netbook had was WWAN (3G access). Yes, I have a dongle with works very well and at only £5 per month is pretty cheap too but it is still another thing to carry. Right now very few netbooks have this onboard but with them being pushed heavily but the mobile telcos it is only going to be a matter of time before they all have them. In the meantime your only choices are to persist with the dongle or to mod. And it is the latter that some enterprising soul has done to their Acer Aspire.
I’m not sure that I have the heart to cut up my netbook like this but if you are handy with a soldering iron then check this out : Modding the Acer Aspire One – HSDPA.