What annoys me is global companies that have release products in a large number of languages but cannot allow for British/Canadian English spellings. Why is it that 13 years after Microsoft first released Internet Explorer I cannot avoid using 'Favorites'?
I do like a u in favour, neighbourhood etc, but I don't like -isation, I generally prefer -ization, although it does seem to depend whether we are talking about nouns or verbs. Organisation looks right to me, but I don't like customise. I just associate z with actions.
Grey and Gray had confused me for a while (I could never remember which spelling is right) until I realized they were UK/US spellings. I can't decide which I prefer.
Meter / Metre is another interesting case where I believe we measure distance in metres but measure the use of water and parking with devises called meters. I would perfer consistancy and would be happier to adopt the US er method for all words.
Americans format for dates is backward and they need to stop using this method as soon as possible. They all understand 6th Jan 2011, so why tell us it is Jan 6th, 2011 or worse still 1/6/11. They should adopt the European date convension or move to the Japanese version (2011-1-6 which is much better for sorting).
I'm glad I've had the opportunity to sort out these problems here!