If you ever used x-perl (dont know about perl classic) with its raid addon actived, you probably noticed that in buffs tooltips it shows a list of people who have the buff and a list of people who dont have the buff.
I stopped using x-perl now, but I really loved this feature when buffing BG raids. Yeah I'm greedy on spell reagents
usually manage to buff a full AB group within the 2 minutes, but manually 'scrolling' through the whole raid looking for people to buff while the leader is sorting groups is kinda annoying. The tooltip thing is simple yet awesome..
Couldn't find anything stand-alone that works like that, so I decided to post this.