Resistance Auras are great for protecting yourself and the party
Depending on your party set up, extra Dungeon Fighter gold and armor may be more valuable to you then extra threat but that will rarely happen. Resistance Auras are also great for protecting yourself and the party but use them carefully since they offer no other benefits.
Other abilities like Blessing of Sanctuary and Holy Shield were covered above because of their threat abilities, but they also help reduce as great deal of damage over time in the process.
Tanking Strategies: So now its time to learn exactly how to use all those abilities. One of the most important parts of pally tanking is getting the pull right. You need to have all of the targets attack you as soon as possible so you can start building up threat. Otherwise they will start to go after your healers.
As soon as your allies have used their CC spells throw an Avenging Shield into the target group. Pick one of them as your main target and start attacking it.
If some of your targets are ranged attackers you need to try and break their line of sight so they will come to you. Or pull the rest of the group towards them so they will melee you a bit. Once you are in position the real job of tanking begins.
First, judge your primary target with a seal. Judgment of the Crusader is best when the mob is very strong like a boss or a very powerful trash mob because of the added holly damage.