The problem with many of the high-end Protection talents is that raid-level bosses (and most regular bosses for that matter) are immune to many of the skills.
Anticipation - This is a great talent while you're leveling or if your Defense stat is low, but since I'm assuming you're the MT of a BWL-capable guild, your Defense should be pretty high. As the others have said, putting 5 points into this may be overkill.
Toughness - This is much better than Anticipation since it actually will scale with your gear. Although this talent isn't particularly useful against casters, neither is Anticipation.
Improved Shield Block - One point should be sufficient in this. It's highly unlikely you won't use the two charges up before the regular duration ends so increasing the duration by 2s won't really make much of a difference. Also, your stats should allow you to be Blocking / Parrying / Dodging and procing Revenge every 5s even without utilizing Shield Block. However, damage mitigation is damage mitigation and Shield Block will always be useful (but not the extra 2s on the duration).
Improved Sunder Armor - Running into problems with Rage generation against raid-level bosses is an extremely uncommon thing (except, I guess, with Onyxia as Gurg pointed out to me). This is an extremely useful talent for clearing trash, 5 man instances, or tanking non-raid bosses perhaps, but I don't think it'll be quite a large factor against BWL bosses.
Improved Taunt - Decent, but most bosses are flat-out immune to Taunts. Again, this talent is very useful for non-raiding environments or clearing trash, but I don't think you have much trouble with that.
Improved Shield Bash - Again, the same problem as Improved Taunt.
Concussion Blow - Same as above.
One-Handed Weapon Specialization and Shield Slam are great talents, but require you to waste a lot of points to reach these. Thus, if you factor in the pre-requisite 25 points necessary to unlock both these talents, they lose a lot of their luster.
Here's a basic tanking template that I came up with. It still has 11 more talent points that can be placed anywhere you like:
http://www.worldofwarcraft.com/info/classe...250110500000000
Here are some notable points:
* 5/5 Cruelty - As a few have pointed out, this talent is very useful since a lot of your tanking skills can crit (Revenge, Heroic Strike, Shield Bash, etc.).
* 5/5 Imp. Demoralizing Shout - At least one person in your raid should have 5/5 of this talent and keep it on everything you fight.
* 1/1 Piercing Howl - Great for those mass-spawn fights (Razorgore, Nefarian, et. al.).