For the most part I have never had issues with threat, unless it is an AoE situation where the dps are hitting the wrong target or they start to rain down the AoEs before the mobs are fully into my Death & Decay.
I have seen people constantly referring to tps, and would like to know a good mod for keeping track of that, especially one that only I need to run.
" 'Thin' is a relative term..."
Omen shows your TPS, but if you're looking for something specifically for TPS, you can try TankadinTPS. It works for all tanks, not just paladins.
TankadinTps - Addons - Curse
Thanks for the responses.
Another good option that works if you want to keep screen clutter and mem usage down but still retain a lot of info is Skada. It contains threat, dps, damage done, healiong meters, and even things like a "fail" count or tracking interrupts (good to tell who's not doing their job on Deathwhisper).