So basically, what Shoutbox is, it's this chat window on the top (or wherever you want it to be) that people can type out things into. I've already seen it implemented in forums, and it works quite well, with some *interesting* things being said
If you want to see it in action, go to :http://cstrike.waspnest.net/ipbnuke2/modules/Forums/index.php?act=idx