Snow, I just thought of something. Maybe when you changed your SMBIOS, it affected the way your MAC address is displayed to Time Machine, hence the MAC address error it's giving you? Perhaps when you changed it back, you didn't reload the kext cache? We're a little off topic on this now, I guess.

Oh, I checked the skgeosx driver that we have from Zeph and it appears to be the same one that was initially released by the guy who made it. Forcedeth, on the other hand, was modded by Zeph, afaik. And I don't know if I even have the latest one. I am using 10.5.2 rev1, but has he done anything new to that kext since then? Anyone know? It doesn't say so in his rev2 thread. It worked alright for me, but it didn't display or connect to network computers properly, so I had to dump it and go back to skgeosx for my Marvell instead. Bah. So much for that test.