We need to decide on whether we are going to use behaviour or behavior, then delete the unused one.
Being from the UK, I'd propose that we use behaviour, but as it seems that the audience is more american than british, it may make more sense to stick with behavior (plus that's currently being used the most).
What do you guys prefer?
The SE sites I've been involved in tend to the American spelling of words for consistency and so make some of the British spellings synonyms of the American ones.
I'm all for the shorter spelling of behavior over behaviour.
Not only will this prevent every potential behaviour-tagging user from having to tap the 'u' key, saving multiple seconds over the next decade, StackExchange will end up transmitting one fewer character every time it displays the word, saving quintillionths of dollars in hosting, processing and transmission fees.
