Addons i use..

Altoholic - to keep an eye for my alts
ArkInventory - to keep better eye for my bags
Atlasloot Enhanced - to see posible loots
Auktioneer - to see the worth of the items i wanna put on AH
Bartender 4 - a mod to move around your skills to a better use
Cartographer - to get better view at map
Deadly Boss Mods - well known it speaks for it self
Omen threat meter - very handy
Pally Power - just for trying it
Player XP Bar - to se XP
QuestHelper - like it says
Recount - to se my total damage and my crit.
SpamMeNot
WIM - an ingame instant messenger for all whisperes and it keeps a track of what you have writen to the person

Thanks for sharing WIM sounds good I'm gonna have to check it out