@rms

Hi, I wonder why didn't you get one of them:
http://www.amazon.com/electronics/dp/B0007OWNC2
which costs 1/4 of the price of the Cisco Aironet Card? (at least price here in Switzerland)

Seems you have some insane prices in Switzerland. I bought Cisco Aironet in Poland for 10 EUR, postage included. TP-Link TL-WN310 costs roughly the same, as well as 12 EUR is the price of PCI based TL-WN350.