Right now the sites statistics page shows that MathOverflow is seeing an average of 38 questions per day. Is there a plot of this average over time somewhere? My perception is that it has been increasing, to the point where not visiting for a day can render relevant questions invisible without some searching effort.
(22May2015). It would be nice to see some data over 2014 & 2015. I tried to run some queries myself but I have not yet mastered enough of the query syntax to do this easily. I note that the number of questions per day is now listed at 39, just 1 more than visits/day in Nov 2013.