Would it be possible to extend chat to notify when certain keywords appear, like IRC stalkwords? That is, when someone writes a keyword they've configured like "unicorn" or "pony", an alert is triggered. This would be shown similar to an @username mention (count over avatar, favicon change, count prefixed to page title).
There are certain topics that I'm interested in learning more about when they come up in a particular room. Also it would be useful in Teacher's Lounge when someone writes "anyone from XYZ SE here?" and you happen to be the mod of XYZ.