I should've Googled harder first. According to http://www.askoxford.com/asktheexperts/faq/aboutdictionaries/officialcommitt... there is no equivalent to the Académie française for English. Furthermore, the OED isn't to be treated as a definitive authority on English as far as the folks at Oxford are concerned.
We should all thank our $deities that it isn't the case. They're the ones responsible for those annoying L' addons to words you'd otherwise recognize, in an attempt to create havoc on the integration of language. Today, I feel most sorry for the German students, who have an official language and committee actively changing the big book of German grammar and spelling rules.
Justin Dugger