Micah made mention we should post which AddOns we're using and what we think of them...got these from Curse-

AutoDismount - when mounted, you can activate any ability and you automatically dismount. Great for chasing down enemies that are fleeing and popping them with a snare without having to find that dismount button first...just to clarify, the first press of the button would dismount you, the second press of the button would activate the ability.

AutoLoot - autoloot when looting items/corpses. Loots everything very quickly so you may not even see what you loot unless you check your logs.

KillingBlow - announces on your screen when you get a killing blow during RvR. Customizable so that you emote something as well.

Moth - Lets you float your pointer over a PC or NPC to see their name, class, and level. If the NPC is part of a quest, you'll see the quest name below the NPC name and a counter if you have to kill, say, 16 of them.

waahbar - think FuBar for WoW. Has a clock which is handy and shows your FPS.

zMailMod - let's you mass mail someone (useful for bank mules). Let's you select all items in your inbox and open/take all attachments in two clicks. Keeps track of who you sent something to last so you don't have to retype their name. *one problem I did have was I couldn't close the mailbox window yesterday afternoon, but there was an update and I didn't experience the same problem yesterday evening at all*