Topic: AMAZING! search posts where they mentioned your name.
So, I have seen this feature in various forums, what it does are:
1. When viewing topic, you can click on user's nickname, and with javascript, it will be copied into Quick Replay box, (so this looks like @stranger: your comment )
2. When "Stranger" will click on his own username (Logged in as "Stranger" made clickable) it will simply search forums and display posts were nickname "stranger" were addressed or mentioned.
I think it's not hard to do, yet - simplifies user communication.