On some other StackExchange sites there is a small box to display chat status.
We have this status box on meta, but on the main site it seems to be missing.
Or as @Grohlier put it on chat.
Once you realize where the button is you go, "OHHHHHHHhhhhhh."
I think it would be good to add this info box to the front page to get more people in the chat.