YESSSS

When using the driver (linux-7.0.0.zip) from broadcom (http://www.broadcom.com/support/downloaddrivers.php)
it works now. (on the livecd version 3.3 from 24/09/2003)
unpack the source zipfile bcm5700-7.0.0.tar.gz to you /home/knoppix

type:
tar xvzf bcm5700-7.0.0.tar.gz

type:
cd /home/knoppix/bcm5700-7.0.0/src

type:
make

type:
insmod bcm5700.o

launch netconfig from menu


greetzzzzzz from Belgium,

PS request on german site (www.knoppix.de) have been made to insert the broadcom driver on the cd.