Notice
As you may have noticed we are focused on pvp / arena, so we did our best to find those addons that could be usefull in the arena for you. That doesn't mean that you should install all these addons, read the description and choose what is best for you. For sure you heard people bragging one addon or another, but an addon it's good only if it gives you what you are missing / lacking, and if you don't customize it may be useless to you. So our advice is to take your time and customize each addon so it provides you the exact information you need and remove all the useless options / information. Try to create an interface that suits you best and stick with it, but feel free to try new things. In arena gameplay reflexes are the key to victory, to react as swiftly posible to certain situations, so a familiar interface that provides information usefull to your class and tactics is a top priority.
Addons can prove to be very usefull if they are used / configured corectly, but they can confuse you if there is too much information, so choose wisely. Recommended Arena Addons: Arena Unit Frames
This version was updated in 09 Dec 2009. One of the best arena addon there is. A special unit frame customized just for arena gameplay, very easy to use, and highly configurable. 
Afflicted 3 This version was updated in 08 Dec 2009. Afflicted is an enemy spell timer mod for PvP (mainly arenas). This is for people who just want useful information, such as an interrupt is on cool down. Arenalog3
This version was updated in 8 Aug 2009. Arenalog3 is a score tracking addon that will passively record all rated arena games played for each of your arena teams. An in-game browser is provided to view your arena history. Decursive
This version was updated in 08 Dec 2009. Decursive is a cleansing mod intended to render affliction removal easy, effective and fun for all the classes having this ability. Clique This version was updated in 9 Dec 2009 Clique is a simple GUI that lets you assign click-casting for any number of unit frames. Click casting allows you to define the behavior the game takes when you click on a frame. This can be casting spells, running a macro, using an item, or something as simple as changing targets or assisting a unit. FocusFrame
This version was updated in 4 Aug 2009. If you really like Blizzard's frames this is one great simple addon that will provide you an aditional frame showing a focused target, the health, mana and cast bar of your focus,the focus of your focus target. Natur EnemyCastBar
This version was updated in 9 Dec 2009 Is a very popular and excellent addon that shows everything from debuff timers, casts, cooldowns, diminishing return, bar customization, rogue detection and has killing blow sounds. Gladius This version was updated in 5 Aug 2009. Gladius adds enemy unit frames to arenas for easier targeting and focusing. It is highly configurable and you can disable most features of this addon.
This version was updated in 4 Aug 2009. PitBull is a Unit Frames addon that provides maximal customization and undergoes rigorous efficiency testing. It is created in a modular framework, which allows for mulitple authors to put their skills to work creating this great project.
PitBull 4.0 This version was updated in 14 Sept 2009. PitBull 4 is a Unit Frame addon and it's a continuation of PitBull. It is currently experimental.

ag_UnitFrames This version was updated in 18 Aug 2009. This is a customizable unit frame addon.
X-Perl UnitFrames
This version was updated in 9 Dec 2009. Another UnitFrame addon. Perl, with Extra stuff. Much enchanced from Nymbia's Perl UnitFrames, and a complete replacement for Blizzard's default unit frames, including raid frames and raid tools, with little remaining of the original Nymbia code. Titan Panel This version was updated in 7 Sept 2009. Titan Panel adds a control panel bar on the top and/or bottom of the screen and allows a framework for extensive plugin support.
ClassPortraits
This version was updated in 21 Aug 2009. This addon shows a picture of the class instead of a portrait, this works on yourself, your party and players you target. Quartz
This version was updated in 18 Sept 2009. Quartz is a customizable casting/progress bar addon. A useful feature is the latency module that displays lag in the form of a red bar at the end of your casting bar. This helps you chain up your spells more efficiently, especially for players with high latency. The Range module recolors your cast bar if your target moves out of range in mid-cast, if you have been intrerupted. Shows the 'basic' timers such as breath and feign death, resurrect timeout, and arena game start. 
ArenaCountDown This version was updated in Jul 28 2009. This is a simple mod which counts down the time remaining before an arena match begins. Arena count down allows for last minute buffs like invisibility to be timed correctly. SpellAlerter
This version was updated in 4 Aug 2009. This addon warns you of any spells that are cast in your range area. You can add more spells to warn you about and set them on different anchors. The warning can display the icon and name of the spell its being cast and the name of who's casting it, you can also chose to only see one of this options. Type /sa for more options. TB Arena Points
This version was updated in 11 Jun 2009. This addon displays the estimated number of points you earn from each of your arena teams, right on your arena team panels. CCWatcher
This version was updated in 18 Apr 2009. CCWatcher is an addon to keep track of all crowd controls on all units. Mainly target at keeping track of crowd control in the arena so you know when time time the next and watch diminishing returns of them. ProximoGrid
This version was updated in 18 Apr 2009. This addon combinds the best from two great addons. The configuration from grid, using status indicators where you select what you want to show, with the posibility to show opponents in the arena. You can now add filters to the opponents buffs, their spell cast and show it as either an icon, text or a small colored square. There is built in support for plugins so it should be easy to add more indicators or statuses. DR Tracker - This version was updated in 23 Nov 2009. Shows time left until diminishing returns on enemy/friendly/yourself, as well as how far the spell is diminished. Shows the next diminish, so for example when a Cyclone first fades from a player it'll show 50%, once the 2nd one is casted within 15 seconds of the first one fading it'll show 25%. StealthAlerter - This version was updated in 5 Dec 2009. Stealth Alerter detects if someone near you uses a stealth ability.
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