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As the poster above said, use Judgement (refunds mana) and Holy Shock (cheap heal that gives Holy Power) as often as you can. Ideally, you want to be able to Holy Shock the DPS as you use casted heals on your tank/Beacon to take advantage of Tower of Radience, but that's not always possible. By default (you may have changed it by now) the Assist button is F. This lets you hit F to switch to your target's target, then you can hit it again to switch to THEIR target. This lets you reliably switch between, say, your tank and a boss for Judgements. As a side note, you might want to pick up Improved Judgement so it's got a nice 40 yard range for you to work with.
Speaking of Tower of Radience, it was recently hotfixed and no longer works with Holy Light. Divine Light should now be your "go-to" spell for your tank/Beacon, with Flash of Light being only for emergencies, and Holy Light (in my opinion, anyway) being best for healing DPS when Holy Shock is on cooldown and there isn't heavy damage at the moment..
Take advantage of your Holy Power, don't sit on 3 charges as you spam Holy Shock and cast spells on your Beacon. They're free heals, use them when you can.
Take advantage of your utility skills. Cast Hand of Protection or Hand of Salvation on DPS who pull aggro. Use Hammer of Justice when you can to prevent damage. If you know there's going to be a large amount of damage coming down on your tank soon, don't be afraid to use Hand of Sacrifice. Paladins have plenty of self healing between Judgement and Protector of the Innocent. If there's lots of elemental damage coming up then feel free to switch to the resistance aura. And don't be afraid to use your CDs like Avenging Wrath and Divine Favor. If you feel you could use the boost then use it, an ability off cooldown never helped anyone after a wipe.
Know how Beacon works with your abilities. Dawn of Light will grant "refund" healing to your Beacon for every other person it heals. Your Protector of the Innocent self heals will also bounce over to your Beacon.
And, most importantly, learn the instances so you can predict when the spikes and lulls in damage will happen. This will help keep you from panicking and wasting mana.
Hopefully this helps.
Edited for clarification and typos.
Edited by Thorgale on 12/15/2010 3:33 PM PST
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