Yeah, I do plan, I think, to upgrade this script after awhile...assuming it continues to get this positive reaction.

"Who's Shouting" is a very good idea...I guess it'd work a little bit like "Users Browsing this Forum"? I suppose I never thought of it because my board isn't big enough to warrant such a thing. And I've been busy with two other significant hacks.
I had a few other ideas, too:
- Comprehensive admin script to edit/delete shouts easily (perhaps in bulk for the latter?)
- Who's Shouting? (good idea
)
- Shoutbox Search
- Shoutbox Smilie Selector (allow admins to easily select which smilies they want below their text box)
- Shouts in last 24 hours (as an admin, and user options)
- Refresh intervals: allow user to select how often the page should refresh, if at all.
That's all for now...a few of those are quite easy of course, but I'd rather do things in bunches.

If anyyone else has any other suggestions, don't hesitate to speak up.