Quassel and probably other IRC clients show notifications to the user for "highlighted messages" i.e. when one of his nicknames (or other particular words or regexp) are found in a message received. This is probably not useful in one to one chat, but it would be really cool if we could have something similar for multi user chats.
It already exists for when your nickname is called.
It doesn't work for me, I get a notification for every message received in a multi user chat. Moreover, in quassel, the message is "highlighted" in orange, and this makes very easy scrolling the backlog to find the interesting parts...