hi, here is the last hexedited version of the AppleBCM kext, this one is specific for BCM5787M 14e4:1693
there is an huge readme included, please read it, it explain everything.
you can have your mac address with this one and i encourage you to set yours
it has been tested on some different configurations and it seem to work, i'm using it to post right now
if it don't work for you,be sure you have a 14e4:1693 device then report here, thanks
good luck

 Broadcom5787M.zip ( 110.89K ) Number of downloads: 10624


N.B. these kexts are intended for Leopard, up to 10.5.8

--EDIT
See this post for BCM5784M - thanks to Boombeng
http://forum.insanelymac.com/index.php?s=&...st&p=963461

--EDIT
UPDATE

Snow leopard (10.6.2 & 10.6.3) Broadcom 5787M kext - do not use this with Leopard 10.5.8 and older.

 5787M_32_64Bit_AppleBCM5701.zip ( 167.93K ) Number of downloads: 792


INSTALLATION: use kext utility to install, or do it manually if you know how.

This kext don't read the MAC address of the card, you need to set it manually if you need, to do it open a terminal
session and type "sudo ifconfig en0 (or en1 if you have more than one card) lladdr YO:UR:MA:CA:DD:RS
it works both on 32 and 64 bit modes.

-EDIT
UPDATE 2

Snow Leopard 10.6.3 only (untested on 10.6.2 and earlier)

 10.6.3.5787M.zip ( 180.79K ) Number of downloads: 1112


This is the last version, and it come from 10.6.3. FINALLY IT SUPPORT MAC ADDRESS FROM THE CARD, no more
needs to set it manually.
Features:
Read mac address from the nic
support 32 and 64 bit modes
support sleep/unloading

To INSTALL, update to 10.6.3 and replace the original Apple kext into IONetworkingFamily.kext/Contents/Plugins
fix permissions and reboot.
(N.B. this has been tried only on the 5787M 14e4:1693, please figure yourself how to modify to work with other BCM card, i can't test)