I use SU more than SO, and sometimes it feels lonely in there. It would be encouraging to know that there is an upward trend of daily active users. I've googled around, and I can't seem to find any information like this available for SU. Perhaps it's in the SO data dump, but that's a lot of data to wade through for simple statistics like this.
Daily active users statistics should be made available--or if they already are available, they should be made easier to find.