The ones they used to put in netbooks were either soldered to the motherboard or were in special modules. They were NOT suitable for use in a normal PC or laptop.
What do you want this drive for? what interfaces are acceptable? if it is for a boot drive what OS will you be runnning (afaict linux can be run off a USB stick, I don't think windows can)
My OS is on a 40GB Kingston SSD which is small enough to be an annoyance with Vista Business. I've considered upgrading eventually but so far it's been easy enough to work around. Less trouble than re-installing at least.