I think I'm going to be doing a lot of switching out to see what I like, Warriors can hit full CTC with two avoidance/mastery trinkets this patch, and I think it that might be useful on fights with high physical damage and relatively low magical damage, like Shannox and Beth'tilac.
I think this is what I'm going to do:
Spidersilk Spindle/Stay of Execution
Symbiotic Worm (H)/Essence of the Eternal Flame (or Apparatus)
Vial of Stolen Memories (H)/Mirror of Broken Images
(one for decimation, one for inferno, single tanking).
Depending on how my healers feel, might use:
Scales of Life/Stay of Execution
Symbiotic Worm (H)/Stay of Execution
I kind of like Stay of Execution better than the Spindle because take it into context.
Spindle will absorb 17K damage every minute, which is 34K every two minutes (assuming you will go under 35% once a minute).
Stay will absorb 57K damage every 2 minutes, and deal you back 23K, (57-23 = 34) and it's on use. You get to control when, and it's about the same amount of absorb as spindle.
I still REALLY like Worm, and I wish I had the Heroic version.
Vial is so useful for Baelroc, since we 1 tank it. Getting to hit that during decimation makes me so happy, same with Mirror for Inferno (you even get to have mirror up every time he inferno's assuming he does inferno/deci/inferno/deci etc).
Scales's proc is along the same lines as Stay and Spindle (hey if Disc priests can call their bubbles heals, so can we right?), but it's just a stamina trinket, and does have any sort of mastery.
So basically, if my healers are having trouble keeping me alive due to magic damage, Mirror and Scales are my options. If it's mostly physical damage, try to cover CTC, and use Spindle and Stay. Baelroc and Alysrazor are special exceptions, where perhaps it's more useful to have special trinkets.
To all the Tanks that gem Stamina: "It's not the magic attack that kills you, it's the physical attack before and after."