The ideal prot pally spec after 3.1 is kind of hard to put into a talent calculator because it depends on what other pallies are in the raid in a few places, as well as what kind of content you're doing. I could be brief and post my own spec, but it was made to maximize what I can bring to the raids I do, not to be a cookie cutter for others to follow. Instead it's much easier to discuss the talents where people normally make their mistakes.
In the prot tree:
5/5 Divinity is pretty much useless. It does not equate to 5% more health. What it really produces is the occasional save when you are hit to low health, healed (but not to full), and then brought back down to a point where the margin of difference is greater than your current HP. In all other cases it will have 0 effect. For a more concrete example: If you get a 13k heal w/o divinity, it is 13650 with 5/5 Divinity. For this difference to be live or die, the hit that comes next, without any other heals landing, must hit you for between 13000 and 13650. For smaller heals the window becomes smaller. That is why Divinity sucks.
Stoicism is pretty terrible, too. Stuns from PvE mobs last, at most, 3 seconds. A 30% reduction saves 1 second. For 3 talent points that it terrible.
Reckoning is terrible and if you don't understand why, either it was never explained to you or you're too stubborn to listen.
Guardian's Favor is laughable.
This leaves the only filler prot talents as DS/DG or DS/iHoJ. I went DS/iHoJ because I'm doing Ulduar. 20 second stun comes in handy for Razorscale, Ignis and Iron Council. DS is useful (so far) only on XT-002, but the point had to go somewhere.
Further down the prot tree, many people take 2/2 Spiritual Attunement. This MAY be needed for heroics, but with 100% DP uptime and BoSanc it shouldn't be. For raids it is entirely wasted. With 1/2 SA you SHOULD be able to maintain a full mana pool, or at least your rotations, if you're playing properly.
In the Ret tree:
Benediction is a bad talent, even for a filler.
2/2 iJudg is overkill but arguably useful. Anyone telling you absolutely not because it "breaks the 969" obviously isn't thinking. It doesn't change anything about the 969 (since you won't be able to judge early if you're holding to the rotation) but it does give the option to change things up if necessary. I skipped it, though.
HotC: Take it if no other pally has it or if the one who does dies all the damn time.
Crusade is better DPS/TPS than Sanctity of Battle, Conviction, or Seals of the Pure.
In the Holy Tree:
If you're getting Seals of the Pure, you better be speccing down to Imp. LoH. If you're not going that far down, there's no point to even starting the trip.
You can see my spec here:
http://www.wowarmory.com/character-talents.xml?r=Tichondrius&cn=Tyneside&gn=Cult+of+Reason