Great that you found this --- I hadn't considered looking to see what else was using the chipset (blush) to make the same discovery.
BAD POO!
BAD!!!
I'm going to give it a try on my OWC / Newer (I don't recall which it is) B/G unit on multiple platforms (PPC Tiger, Intel Leopard, Snow and Lion, and will have the info hopefully soon, if anyone is interested.
In fact, once I boot up all the PowerPC units in this house, ALL THE HOMES ACROSS ATLANTA WILL DIM, and I can try that under Tiger and Panther just to see if it works via PPC (if that is a Universal driver or if they have one -- I've got to read their site closer).
My G4 Mac Mini is the most important one, however, because it's got no wireless (upgrade kit was as much as I paid for the machine!! And I bought it new, on clearance!) - and a used Airport I bought for $10 in 2007 burned out the ethernet port on the unit (and made me very VERY mad) -- so I use that adapter on it, but it doesn't connect to both WPA / WEP, only the older of the two -- so I have to stack routers to get it to work.
My next project, after this one, will be removing the G4 and installing an IBM Power 7 (8 core, 32 threads) and 1TB of RAM into this Mac mini... but I have to get this $15 wireless thing working before I drop $8,000 on a CPU, $20,000 on engineering an adapter board, and soldering all that RAM together as one giant stick.