Thanks lukemdfree, now I'm back online with your help. In fact I'm posting this with my freshly working WG111v3 dongle on Snow Leopard 10.6.1! anyway, for those who're still facing problem to connect, I just want to add here few more steps to I had to take to make it work.

1. repair your SL disk permission
2. replace/add the RTL8187bt.kext file into your /System/Library/Extensions/ folder
3. install the Netgear WG111v3 MacOS10.5 utility (except for the driver)
4. download & run USBEHCI Updater Installer (thanks Superhai & insanelymac.com)
5. restart & boot in 32bit

you might want to try repair permission before you proceed with all those installation or after, depends on your situation & luck! anyway this is my 1st post and I'm really happy to get my internet back on my Snow Leopard! Thank you everyone.