I have a similar problem, but it happens on my wired network card too.
When I boot my machine it works correctly.  But then when I
suspend/resume, the card gets a different MAC address.  If I
suspend/resume again, it gets back its correct MAC address.  It
continues to alternate between its correct MAC and a new one.

For example, in 6 resume/suspend cycles I got this result:

eth0 00:1B:24:0B:D1:E5
eth3 00:00:6C:BE:14:42  
eth0 00:1B:24:0B:D1:E5
eth4 00:00:6C:1C:5E:CC
eth0 00:1B:24:0B:D1:E5
eth5 00:00:6C:7C:75:DE  
eth0 00:1B:24:0B:D1:E5

This is on Gutsy with a custom linux 2.6.22.15 kernel.  I'm also using
the forcedeth driver, as some others above.

00:14.0 Bridge: nVidia Corporation MCP51 Ethernet Controller (rev a3)

I understand how to keep the ethX from changing, but what I really care
about is the MAC address.

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Ethernet device's number increases by one after every reboot
https://bugs.launchpad.net/bugs/153727
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