lose control, elkanos buff bars, x-perl unit frames/pitbull, gladius (if u do war games), saysapped, spellflash, bartender 4 and shadow
Dominos - Neat spellbars which allow you to add key bindings which are very useful in PvP combat because it allows you to use your mouse to move and keyboard to use your abilitys this will help you alot!
Dominos - Addons - Curse
SpellFlash - SpellFlash Racials - This will make a racial ability flash when recommended to use it, for example you are a undead and have been feared it will tell you to use Will of Forsaken or if you are a blood elf and a enemy priest nearby is casting a heal SpellFlash will make Arcane Torrent flash on your spellbars to let you know that you should use Arcane Torrent.
SpellFlash - Addons - Curse
RangeDisplay - This shows you the range of the people you target, your focus and your mouse over. This can be very useful as you will know if your thrown is in range or if they can attack you with there ranged spell or ability and it is also very easy to use.
RangeDisplay - Addons - Curse
MikScrollingBattle Text - This AddOn shows buffs, debuffs and when you enter and leave combat and much more. This is quite useful in Warsong Gulch for letting you know when you can stealth and do other abilitys.
MikScrollingBattleText - Addons - Curse
Recount - This AddOn is great if you are in a dungeon perhaps getting gear or getting to know what your spells do a bit better because it can show you your threat which will allow you to step off a bit and let the agro go.
Recount - Addons - Curse
X-Perl - This AddOn is great if you like your UI to be nice and tidy as it changes your unit frames making them much nicer and this AddOn will allow you to see what class people in your group are by colour scheme and class logos.
X-Perl UnitFrames - Addons - Curse
deadly boss mods pvp - pvp timers
saysapped - /s Sapped when your sapped
cant heal you 3.14 - tells someone you cant heal for w/e reason e.g /w <name> cant heal you your out of range
healers have to die - notes you when healers are attacked and gives the healer logo above their head
nugcombobar - combo bar for rogues also for holy shock
omen 3 - threat metre
quartz - cast bar gives you a good awareness of latency
stealth alerter - tells you when someone casts stealth including enemy faction