I will say that I am only level 78, and I have only done about 5 of the instances in Northrend so far. However, I assume that my experiences so far won't really change a whole lot once I hit 80 until I get into heroics/raids/difficult content.
Most Paladin Librams now seem to be ones that give a crit bonus after a successful judgement. I believe that mine raises my crit rating by 61 for 5 seconds after a judgement (that does not miss).
In order to build a huge threat lead, I am finding that rather than throwing my shield and allowing the mobs to come to me, in MOST situations, I am putting up HS, running up close enough to judge wisdom on the main target, AS'ing the main mob and 2 others right in their faces, using HoR, SoR slam the main target, and consecrate. This takes less than 10 seconds, and everything I do after the judgement (except the consecrate which is outside of the 5-second window because of GCDs) has a higher chance to crit because of my libram.
Just by doing this opening rotation I have such a huge threat lead that the DPS has no chance to pull anything off of me unless they are DPS'ing targets which I haven't even marked.
The bad part of this is in many cases I have gotten out of the habit of marking targets alltogether or I might only mark the one target that I know I want to see go down first. I realize that soon I will probably have to get back into better habits, but for now it works fine.
The exception to this is if there are several groups of mobs in relatively close proximity and I don't want to chain-aggro everything by getting too close. In that case, I will still throw my shield and wait for one pack of mobs to come to me.
Edited, Dec 4th 2008 2:10pm by jeromesimina