PVP ret build.
This is the basic PVP retribution build. It focuses on burst damage and survivability while still covering the basics of healing.

PVE ret build.
You will be hard pressed to find a party that will take you on as ret speced, but this will help by increasing your sustainability and buffing your group as well.

PVE ret/prot hybrid build.
This is side build that will let you switch between tanking and DPSing in a raid. I find it works well in ten mans when we need an extra offtank to clear trash or boss adds, but still want some extra DPS.

Leveling Build.
Most of the builds above require you to be max level in order to gain their full benefits. But during the big grind it is often more beneficial not to aim for powerful low tier talents and slowly crawl through the tree to reach it. Instead you should try to gather as many useful high tiered talents as possible. As you will see in the guide. Seal of Command is a great ability for leveling, but until you can get the 11 talent points to use it you will grind through those levels much more efficiently with Divine strength and Spiritual focus instead of Benediction. Once you have reached level twenty and have enough points to use SoC you then head back to your trainer and have him reset your talents for gold.
Level 10- Divine Strength 1
Level 11- Divine Strength 2
Level 12- Divine Strength 3
Level 13- Divine Strength 4
Level 14- Divine Strength 5
Level 15- Spiritual Focus 1
Level 16- Spiritual Focus 2
Level 17- Spiritual Focus 3
Level 18- Spiritual Focus 4
Level 19- Spiritual Focus 5
Respec Number 1.
Benediction 5/5
Improved Judgment. 2/2
Deflection 3/5
Seal of Command.
http://www.worldofwarcraft.com/info/classes/paladin/talents.html? 0000000000000000000000000000000000000 000000520300100000000000000
Level 20 Seal of Command
Level 21 Conviction 1
Level 22 Conviction 2
Level 23 Conviction 3
Level 24 Conviction 4
Level 25 Conviction 5
Level 26 Divine Strength 1
Level 27 Divine Strength 2
Level 28 Divine Strength 3
Level 29 Divine Strength 4
Level 30 Divine strength 5
Level 31 Spiritual Focus 1
Level 32 Spiritual Focus 2
Level 33 Spiritual Focus 3
Level 34 Spiritual Focus 4
Level 35 Spiritual Focus 5
http://www.worldofwarcraft.com/info/classes/paladin/talents.html? 505000000000000 0000000000000000000000000000520305100000000000000

Split number one
At this point you have to make a decision on what your play style will be. If you intend to do a large amount of instancing and group PVE activities then I would suggest you follow the first route. If you intend to do a great deal of PVP, or you intend to solo grind your way up you will want to go the second route.
Route one- Holy and Healing.
Level 36 Aura Mastery
Level 37 Healing Light 1
Level 38 Healing Light 2
Level 39 Healing Light 3
Level 40 Divine Intellect 1
Level 41 Illumination 1
Level 42 Illumination 2
Level 43 Illumination 3
Level 44 Illumination 4
Level 45 Illumination 5
Level 46 Divine Favor
End route one and put points in Retribution like route two.

Route two- Retribution
Level 47 Improved Retribution Aura 1
Level 48 Improved Retribution Aura 2
Level 49 Vindication 1
Level 50 Vindication 2
Level 51 Two Handed weapon specialization 1
Level 52 Two Handed 2
Level 53 Two Handed 3
Level 54 Vindication 3
Level 55 Pursuit of Justice
Level 56 Vengeance 1
Level 57 Vengeance 2
Level 58 Vengeance 3
Level 59 Vengeance 4
Level 60 Vengeance 5
Level 61 Repentance
End route two and put points in Holy like route one.
http://www.worldofwarcraft.com/info/classes/paladin/talents.html? 515031005001000 0000000000000000000000000000520335110203005001000
Respec 3
Go back and respec your talents to the following build so you can use Crusader Strike. From here on the best bet is to put your remaining points in Holy to help with your healing, since there are few good Retribution talents left.

Level 61 Healing Light
Level 62 Healing Light
Level 63 Healing Light
Level 64 Divine Intellect
Level 65 Divine Intellect
Level 66 Illumination
Level 67 Illumination
Level 68 Illumination
Level 69 Illumination
Level 70 Illumination
Your final build should eventually look like this.