This would be a great way to get people in a chat at the same time. By being able to see external to the chat that someone just logged on, it would encourage others to do likewise to say hi. Maybe this is already possible somehow?
Check out the who's online demo include with your package... this gives similar functionality. An RSS feed would be inappropriate, unless you had very very few members logging in (RSS feeds aren't supposed to be constantly flushed with new feeds).
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