My brother has a rather solid protection spec'd warrior, in fact, he's too solid - he has issues gathering rage due to mobs not being able to penetrate his defenses.
We were discussing this issue today and came up with a pretty solid solution - since warriors can currently get rage from shield blocks, why not add parries and dodges as rage building items too?
Additionally, how's about also creating aggro whenever a warrior blocks/parries/dodges a blow as after all, a mob is going to get angry that it can't hit the warrior.
Just a suggestion to pass around and/or lobby for if you guys think its a good one (my tank toon is a feral druid).