This is a nice feature in the forum. I just noticed it tonight. If you click on a persons username, it tells you if they are still on the forum by telling you what time their last action on the site was.
I know most of the posts here are complaining about the features or lack thereof in the forum, but I thought I'd call recognition to one that is actually nice to have. Sometimes you make a post, or reply to a persons thread and you wonder if they are online and have seen it, or if they just posted and logged off. It's nice to be able to see when a person was last online, because it lets you know that they are actively clicking around the forum.
Anyways, just wanted to give a "thumbs up" to the forum for a a feature that I thought was pretty handy.