Van Macfixit.com:
...Currently only Hewlett Packard, Canon, and Epson printers are listed for compatibility. However, David Green reports that his Brother printer works flawlessly:
I am running a Brother HL-1240 monochrome laser printer through the USB port on the new Airport Extreme Base Station, and printing from a 400MHz Ti-book and a 14" iBook. (Both computers have the old Airport card, of course.) Even though this printer is not on the official Apple compatibility list, it works like a dream. No problems at all. I can't begin to describe how cool it is to be able to print from anywhere in the house/office without having to plug in.
Blijkbaar werken sommige Brother printers ook!