I just went through this ordeal.
1. Buffalo does not supply Max OSX drivers.
2. Buffalo has an auto install mode for Wintel boxes.
3. Buffalo buys the chipset from RaLink Technology
4. You will have do download the RaLink drivers from their web site at
http://www.ralinktech.com/supp-1.htm
5. You will have to flip the dip switch on the side of the adapter.
6. you will have to hack the driver using Property List Editor (developer tools).
7. what you have to add is:
you have to change "Info.plist".
The file is below.
/System/Library/Extensions/RT2500USBWirelessDriver.kext/Contents/Info.plist
Add the following strings.
<key>Buffalo</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.Ralink.driver.RT2500</string>
<key>IOClass</key>
<string>RT2500USBWirelessDriver</string>
<key>IOProviderClass</key>
<string>IOUSBDevice</string>
<key>bcdDevice</key>
<integer>1</integer>
<key>idProduct</key>
<integer>103</integer>
<key>idVendor</key>
<integer>1041</integer>
</dict>
For more info on folks blood, sweat and tears, see RaLink's forum on this topic at:
http://61.222.76.235/phpbb2/viewtopic.php?t=504&start=0
Good luck.