Here it is:

1. Get a nice registry editor like RegEdit CE (use Google to find it dammit!)

2. Edit the following keys:

At [HKEY_LOCAL_MACHINE\SYSTEM\Comm\WLLUC461\Parms] change the empty key "NetworkAddress" to whatever MAC you want, for example 022CDEADBEEF (yes, it's a string type)

At [HKEY_LOCAL_MACHINE\SYSTEM\SOFTWARE\ORiNOCO\Driver\ Config01] change the same empty key to the same MAC you entered before.

3. Exit the editor, re-insert your card, and you're done!

I've been doing some sniffing on the cabled side of my network, and the MAC does indeed show as the edited one.

Enjoy!

Mother