active member = posted in the last x days / x weeks currently active member = is online and logged in at that time Monthly average + guests? Dunno, but Hodapp or arn must know. I would guess around 150.000 visitors?
The statistics on http://toucharcade.com/about take into account the forum traffic and front page traffic and are actually likely fairly out of date by now since I think the last time we updated that was a good 6 months or more ago. The auto-generated VBulletin stats are based on the forum only, which is where the massive discrepancy comes from. Sadly, not everyone dabbles in the forums.