To solve these Wireless problems with laptops and Broadcom chips, you
can also buy on of these PCMCIA wireless cards and disable the
internal Broadcom wireless device. I have a Dell Latitude D600, which
came with an internal wireless mini-pci card, with Broadcom chips.
This didn't work with Linux so I acquired a Cisco wireless adapter,
which was perfectly recognized by Ubuntu.The card will also give you
better coverage, as the antenna is situated on the bit sticking out.