Many netbooks only come with one mini PCIe card, which is taken up with the wireless card. While a few others have an extra one. The Samsung NC10 on the other hand, the motherboard has a second PCIe option printed on it but, there's no socket for it. SammyNetbook user, graemem figured this out when trying to add the Broadcom HD decoder. His solution, to add the second PCIe card, was to buy a socket and solder it onto the motherboard. You can view graemem's instructions on how to do this yourself here with photos but, it is advised to be very careful.
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A post from the Asus Eee PC blog.
Add an extra PCIe slot to a Samsung NC10