I'm assuming every proposal currently in beta wants to get out of beta. Here are some charts showing data gathered from each beta proposal's Area 51 page. The data fetched is what I call the "vital signs" of your beta:
I haven't included the total number of users/days in beta yet, but that's a couple of lines of code away. I'm going to update the charts once I get these values, and keep them updated maybe once a week, or something, so the data doesn't get too old. Note that I've had help with the fetching.
The whole process is done in Mathematica. If you want to use the code provided in the parent question, go ahead. If anybody thinks of a better way to present the data, just ask it in the comments or, if you have access to Mathematica, try it yourself!
As of March 24, 2012: