Amorph is quite right. For the past few months we have (not so secretly) been working on a replacement for AppleInsider that will be powered by vBulletin. One of the many new features that vBulletin offers over our current UBB software is the abitlity to see what users are online and what pages they are currently browsing. The same page also gives quick links to each member's profile, e-mail, and PM system. The IP address is ONLY viewable by forum Moderators and Administrators.
Here's a sample snapshot of said page: