Just bought TL-WN725N because of this thread, and it doens't work oob, but if you download and install the driver RTL8188CUS for 10.8 on http://www.realtek.com.tw/downloads...n=4&DownTypeID=3&GetDown=false&Downloads=true
then it works, seems airdrop is working as well!
D-Link DWA-127 usb WiFi card also works in ML. However, it doesn't work OOB; you have to install the Mac OS X drivers, and after that, you have to manually connect to the desired wifi network in every reboot (it's only a couple of clicks, but it's still a bit annoying). This is the card I was already using for W7, so I don't have to buy a new one
This card does not work 00tbYou may also want to consider a NANO USB (depending on your wifi needs a,b,g, or n) - take a look to this one from TP: TL-WN725N
Also from ASUS you could connect this via Ethernet: Asus WL-330N3G