Maintain the heritage
What's wrong with the [.co.]UK heritage? [And I thought us Aussies were supposed to be the masters of the "cultural cringe"]
I read El Reg, and have for years, BECAUSE of the pommy heritage - which means the tongue firmly in cheek, a healthly disrespect for authority, unquenched bemusement over the goings-on across the pond [different pond to ours in Oz, but same effect]. In summary, a good dose of reality in the unreal world of technology. Your slogan ["biting ...] says it all!!
I sincerely fear that ditching the co.uk URL would dilute your distinctive in the IT world and inevitably cause a blending into the generic [ie US flavoured] networld.
LONG LIVE El-REG.CO.UK !!
Unless, of course, you rellay covet THEREGISTER.COM.AU, which is currently squatted by a Mr Nicholas Vida [perhaps he's open to an offer], although theregister.net.au is still up for grabs ...