a have wifi USB Gigabyte GN-WB01GS WLAN on chip RT2571 WF
more info product >> http://www.gigabyte.com.tw/Products/Communication/Products_Spec.aspx?ProductID=989

producent GIGABYTE don't have driver for my device
http://www.gigabyte.com.tw/Support/Communication/Driver_Model.aspx?ProductID=989

I'm because install driver for mac osx "USB (RT257x/RT2671 for OS 10.3/10.4 ver. RT2571W :1.1.7.0 )"
from http://www.ralinktech.com/ralink/Home/Support/Macintosh.html
RTUSB%20D70-1.1.3.0%20D71W-1.1.7.0%20UI-1.3.0.0_2006_11_10.dmg

"System Requirement:

Mac OS X 10.3.X or 10.4.X

Hardware Supported:

Ralink RT71W chipset USB NIC
Ralink RT70 chipset USB NIC

Software Supported:

For Mac OS X 10.4.X:
USBWireless-10.4\USBWireless-Tiger.pkg"

more to pdf add to post
and not woks on Zephyroth Leopard 10.5.2 AMD

to "Zephyroth Leopard 10.5.2 AMD" new add suport :
# WiFi : Ralink RT73 and RT2500

Leopard see me of my USB device's :

producent : "Ralink"
PID : "0x8008"
VID : "0x1044"

>>> Please help me! <<<<<

Zephyroth Leopard 10.5.2 AMD-EFI have a drivers for you wifi I have same chip Ralink with USB adapter Conceptronic branch
are now working on my system, on the DVD have a package for that, check it.

My Leo Device ID as : Product ID: 0x3c22
Vendor ID: 0x14b2

The chip posible differ remark for branch, i look issues about on Google, you can probe the supplied DVD package fi wireless ralink.