Weird behaviour:

Suppose it's 11:50 PM server time and you log in, do stuff. As soon as it's 0:00 AM server time, the active today section on the home page clears and starts to fill with people logging in *after* midnight. So if you're still logged in, you won't appear counted among the users active that day (until you log out and log in again).

Surely, the 'clearing' of the 'active today' section could be determined not to wipe out the users still logged in at 0:00 server time, I suppose?