Icesnake’s Add-on Emporium #1: Omen3
What is a threatmeter and why do you need one? I’m glad you asked! The threatmeter (“TM” from now on) displays the threat generated by your party members and allows you to adjust your playstyle to stay where you need to be compared to other party members (if everyone in the party is running a compatible TM; this is crucial). If you have ever seen a warlock pull aggro off the tank during a boss fight (almost always followed by a raid wipe), you understand why you need to know where you stand on the mobs’ threat tables.
Omen3 displays the top threat levels in a small window which you can move around the screen, and lets you choose some parameters to customize the display a bit; I’ll leave the details for you to discover, and simply say that the “right-out-of-the-box” experience will make everyone’s life in a party or raid a lot simpler. If you’re the tank, you know you want to be at the top of the threat list; if you’re a ranged DPS type, you know you want to be down around number three. Omen3 lets you see at a glance if you need to step up or back down on threat. It’s fairly lightweight, and can be set to hide itself when you’re not in a party.