So there's another vBulletin-based site I go to and they have a Mention/Quote notification system. Obviously, the system notifies you when you have been mentioned (through use of like @Jamesie; or [mention]Jamesie[/mention]) or quoted.
I think it'd be a pretty nifty system, at least the mention system, to have on ggftw. Would it be an easily added feature? I personally really like it so I don't have to stalk threads like a hawk/vulture if I'm in an argument with someone to see if I've gotten a reply.