Back in late 2011, Juju made a post statistic graph script like what Kerm had on Cemetech since 2010 or so, which displays forum daily posting statistics since opening. That graph is used on Omnimaga and was implemented by Juju, but he was demoted in March 2012 so the version we got is not as recent as theirs. However, they removed trend lines/averages, for some reasons, although they fixed missing 0-post days, so we got the trend lines back, at the cost of skipping 0-post days (although it's not an issue yet since those haven't happened yet)
The graph is very small, though, because we haven't been open for very long yet, it still lacks resizing features, and the year is still cutoff as a result (the vertical line is Jan 1st 2015). However you can see the result below (I'm gonna add it to the forum statistics page soon):
(http://codewalr.us/statsgraph.php)
What would be cool in the future is if juju could implement a feature that displays the record high, record low, in addition to the highest and lowest averages with the dates, but I don't know if that would be too demanding for the server.