Well netbook certainly has the cost and portablility benefit, but recently a new problem has been reported by the actual users of netbook, and this problem is that of Security. Netbook is generally a lesser capable atom processor and lesser memory compared to a laptop configuration.
Hence the problem of memory Resident internet security products is likely to be encountered in the Netbooks segment. Modern Anti Virus tools are memory and resource hungryy and even slow down a Desktop so what is a netbook in front of Intenet Threat.
If you dont use a security package you are likely to falter in protecting your device from online threats.