On this machine 6.4GB SSD (3.0 used, 3.4 available) all significant storage on external drives or cards. I could cut out a couple of browsers, a media player, and a few system tools if space were a problem, but see no reason to stint things. I doubt that Windows would fit on this, but a lightweight Linux system (Bodhi at the moment) is fine.
It purrs along quite happily for surfing and e-mails, will do word processing, music and videos if required. Of course it would be of limited use for what might be called serious computing, but that isn't what a netbook is designed for, and it isn't my forte.
One can use heavy artillery against mice, but a trap works too.