This macro for paladin tanks it works pretty good with right gear and spec. It works for me very well when I tank once in a while. Basically this brainless macro has a small sequence with modifier for Avenger’s Shield and pops cooldowns whenever available.
/castsequence [mod]Avenger's Shield;reset=9 Judgement,Holy Wrath,Hammer of the Righteous,Judgement,Crusader Strike,Crusader Strike /cast Consecration /cast Holy Shield /cast Divine Protection /cast Ardent Defender /cast Avenging Wrath /use 13 /startattack
UPDATED July 8, 2011: Revised for Patch 4.2 and also added trinkets.
UPDATED July 23, 2011: Added Holy Shield instead of 1 trinket for more avoidance in less time (Thanks to Baine for the idea).