Is there a way to visualize the time-dependent statistics of our site, like how the requirements for coming out of beta changed so far? The small box to the right (Site Stats) and the Area 51 stats give only snapshots, though it would be nice to see the trends in a more straightforward way. Are we progressing or declining? For me, it seems like there is a slowdown in most of the statistics, though I can't tell whether the pace we attract new users is increasing or not. (A related question should be: if there is a decrease, what can we do about it?)
I have been noting down the Area 51 statistics each day, and every week or so I post the resulting graphs in the chat room.
It is also possible to use the StackExchange API to get a lot of similar information. The raw data can be loaded into Mathematica in JSON form and processed.
I'm a bit busy right now, but since I was unable to solve a related Mathematica question, I will post a question on the main site that reveals how to do it at some stage (when I have time).
Have you seen the graphs that Verbeia posts in Chat from time to time?
As I moderator I have access to various site statistics, but I am required not to share specifics. If you have general trend questions I believe I am allowed to answer those.
CHM has provided code for scraping Area 51 pages and comparing across all betas in this answer. This is different from what I am doing, which is to track just our site through time.