It's a nice feature and a good idea. However, the current "online
time" text of the current page is kind of confusing - just what is
that about exactly? HTTP is a stateless protocol, there's no such
thing as "online" - so what is that page really showing us?
There should be some brief text on that page explaining what the
numbers mean, probably in a small font either immediately above or
below the table of online users.
