Hello. I just noticed that forum's current 'Most Online' is 2743 for October 2013. I am not sure but it looks like a bit big if compared with the last one (1131-Sept.2013). May be the ongoing Rome Faire or the last maintenance has to do with it. Regards!
You have to consider that now the Arduino Forum is far more visible and easily reachable by people visiting other parts of *.arduino.cc. I can easily figure the mass of people that, reading the Arduino Blog, tried to explore the (massive) menu on top of the page and found for the first time the link to the Forum (which has always been smaller and hidden in the minimal grey bar).
Expect an increase in traffic, here