Well let me tell you the story first ! I went to the store where there's a nice girl who let me look for every single Wifi Dongle she sells in her computer (like browsing Insanelymac and other forums for a 64-bits wifi usb dongle for ML)... 2 TP-Link WIFIs aren't supported and the other is called Netis WF-2111 ... what's more amazing that it has a Realtek Chipset and a few minutes ago I installed ML GM to test it (first I tested it on DP1 64Bits mode ) and it worked on both DP1 & GM (64-Bits) !!!
So anyone who has this wifi dongle or want to buy it , I really recommend it , it only cost me 15$.
Here's the Driver I used for it to work. it says it's for 10.7 but it works perfectly on 10.8 (64-bits) as I said above. just install the pkg file normally and click Restart .. boot to your 10.8 ML GM partition and you'll be amazed!
and the proof below:
hope this helps .. Just so you know... the wifi dongle looks so simple & it's a tiny one.. you can Google it ...