So I unwittingly clicked 'OK' and allowed the Apple software update of my system to 10.6.6 (which some people think should be re-titled '10.6.6.6' because it's -evil-™™™™)
It killed my ethernet. Wireless was still ok, a saving grace, as it allowed me to check the forums and then download the Combo install for 10.6.6.
I booted into safe mode (hold shift key while starting up) and then installed MacOSXUpdCombo10.6.6 (.dmg) which I got, at the time, from here http://support.apple.com/kb/DL1349
Hope this helps someone.
D
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