I'll just add what hasnt been mentioned or I feel strongly about.
1. All thats been said on beneficial AA's is good. I skipped through, but didnt see Shield Block mentioned specifically.
2. Act Of Valor, Unicorn(y) are two AA's I have not and will not buy because they are so useless, also giving us advanced bandaging is very poor.
3.New stuff. I've said before a weapon expertise set of AA's would be good. An AA that increases your attack, parry, crits, etc for each weapon type i.e. 1 h slash 2 h slash etc. Melee would get aa's for all weapon types they could use. Hybrids would only get to choose one, and either the cost of subsequent weapons would be higher than melee, or they could only have one, but could change it by buying a new weapon aa.
A familiar, in the form of a Falcon that increases attack rating, accuracy, agility etc, much like the familiars in TSS but a little better. Maybe it can swoop down and peck out the odd eye
The use of a 2 hander with a shield, now I'm sure there'd need to be a penalty for this, I'm just not sure on what penalty would still make this worth while. Maybe reduction in attack or accuracy? Each lvl of aa could reduce the penalty a little.
A discipline. Much like the warrior one that allows you to crit on every hit but for undead only. As long as slays werent reduced mind you.
Shield Block. Last time around Warriors got an upgrade on Shield block, but it was a class specific upgrade, to help them use a shield while tanking and holding agro. Although increased dmg would have been nice I wont loose too much sleep over it. More % to block an incoming shot would be nice, but how about a timed AA where it reduced dmg by 10, 20, 50 % for 30 seconds? Or procs a heal? Or rebounds the damage onto the mob? (up to a certain max, to stop any exploits) Or blocks spell attacks.
Deity attack. We are supposed to be Holy Warriors, how about an AA attack that calls down the force of our God? Each race would have a different attack, Quellious a cold attack etc?
Ability that when rezzing, your rez brings back 10 20 50% more HP/Mana/Regen (Clerics would need to get this too, or there'd be hell on, also give them 25 50 75%)
4. On expendable AA's I had heard that the current one that puts your HP''s up doesnt stack with Shammy/Bsty buffs? Is this correct or if it was has it been fixed?
Ability to allow you to put a no trade item into your shared bank to pass to an alt 100 AA's
Ability to make an item attunable again from no drop 200 AA's.