Slightly off topic, but do you have any idea how often the average is recalculated? I only ask because I've noticed that my average hasn't changed since it appeared in the top bar, yet I've doubled my total karma in the last two weeks.
Based on the formula you just gave, my average should be 3.27, but it still shows 2.55.
I realize it's a bit of a meaningless metric, but it's something I've been idly pondering for a few days.
