BossStatusWhisperer
Re-work of SimpleBossWhisperer by Rabbit, that was no longer maintened. The original addon can be found on wowace.
Usage : Just install BossStatusWhisperer. During a boss fight, people whispering you will get a reply saying how many % the boss is. People can send you 'status' to get an update on your progress. You don't need Bigwigs, DBM or any bossMod for this to work.
Does this still work?