This is a post I made on our guild boards to help get our new Paladin's up to speed with the roles we have for Paladin's on our raids. It is not necessarily complete, and I would welcome additions and corrections. I thought this might be interesting for some of the up and coming Paladin's on the board. Primarily this guide assumes a level 60 plus Paladin raiding high-end Luclin and mid-end PoP (i.e. as far as my experience takes me). To an extent this applies to SKs also.
Tanking
Paladins may occasionally tank boss mobs where holding aggro is very difficult for a Warrior (mem blur, shadowstepping, knockback). Example Tallon Zek. Chain stun spells to hold aggro. Paladins may also tank when clearing trash due to being able to get fast aggro to speed up the clearing process.
Offtanking
This is a common role during a raid, especially in places like VT. It is important to offtank without using damage - so stuns with /attack off. Two reasons:
1) If the mob is mezzable, you will not break mez when the chanter gets around to it.
2) If you are not getting heals, and need to root and back off you will not get summoned. Shackles of Tunare is one of the best ghetto CC spells in the game. Use it and love it, but if you root make sure it is out of melee range of the raid force. I always offtank in a corner somewhere if I can.
When a pull has multiples, stand back and watch the battle unfold. Watch for mobs that go for casters rather than grab the first mob you see. This can avoid a common occurrance on raids: Two knights on the same mob having an aggro competiton.
On some raids - VT especially, offtanks may be assigned mobs (assisting a SoS rogue), which makes target aquiring easy. If you do not have an assigned target, be aware that unexpected adds can and do happen and be observant until it is obvious that the pull doesn't have additional adds. Assisting the chanter and throwing a stun on their mobs can help them with mezzing also.
Remember, no damage offtanking! Chanters gets all grumpy when their mezzes are broken
Rampage Tanking
If you are assigned as a Rampage tank, throw a low aggro spell like Cancel Magic, just before the Main Tank engages (or earlier if the mob is perma-rooted). This should put you on the rampage list. Also make sure you have a hotkey with /rsay <<< YOUR NAME >>> has RAMPAGE, or something similar.
Group Healing
Paladins have Wave of Marr, and Healing Wave of Prexus, plus the AA Hand of Peity, which makes us awsome for healing AoE. It is a good idea to group us with DPS melee classes who shouldn't be taking melee damage but will take steady AoE damage. For our group heals to be most efficient, a full group is ideal.
LoH/Soulfire
Occasionally, a Paladin may start a Complete Heal Chain with LoH. Always be ready to use it to save a life. I often target the Main Tank until the mob is slowed so that I can throw in a patch if it looks like she will drop. Otherwise, if I have a cleric in my group, I tend to save it for them.
Can I urge all Paladins to complete the Soulfire quest and keep a charged Soulfire on them at all times (or as often as possible). The quest is easy to solo for a 65 Paladin, and only the first time takes a long time because of faction work. I can now solo Soulfire in 4-7 hours depending on how lucky I am on spawns. You can also have a second Soulfire in your shared bank, and another ready by having turn in items in case you burn your charges. Do not use your Soulfire in exp groups, save it for raids emergencies.
I can't emphasise enough how useful having 3 or 4 paladins with 5 charges of INSTA-click Complete Heal can be in saving raids.
Buffing
From a raid perspective, for a player to maximise their hitpoints, Brells Steadfast Shield is a must have buff. It does not stack with Strength of Tunare (Ranger) or Spiritual Vigor (Beastlord) - Inform the raid prior to casting BSS to click off these two buffs if they want to maximise their hitpoints with BSS. If there is more than one Pally with BSS share the groups, or even better Mass Group Buff(MGB).
Many guilds standard MGBs are Pot9 and Symbol. As this is the best set-up for everyone except us Paladins and Clerics. Make sure to ask your local friendly Cleric for Virtue using a /tell, and get Aura of the Crusader up. If you do not have Aura of the Crusader, then you are better off with Pot9 and Symbol.
Stunning
Stuns are effectively a ghetto slow. Even if you are not tanking, if the mob is effected by Force of Akilae, once the main tank has FIRM aggro, you may as well stun the mob as they are available. When I am not feeling lazy, I FoA trash mobs as soon as they reach the Main Tank, which gives her a few seconds grace while the mob is unslowed to build aggro.
We can also use our knockback stuns (QWoS and Divine Stun) to help position mobs.
Cure Curse/Disease/Poison
Crusaders Touch and Remove Greater Curse have their situational uses. We are not the best at curing though, I tend to leave this to clerics.
Taking Death Touches
What do you think Rangers are for?
Please feel free to add more! These are just a few of my own thoughts.