I'll just post a few of my thoughts on out talents/glyphs
Lvl 15 Talents: I believe Harvest Life takes the cake on this one for every tank build.
Lvl 30 Talents: Not much for tanking here, though Mortal Coil gives 15% HP, I gotta choose that one (unless I need the interrupt of Shadowfury)
Lvl 45 Talents: These talents are ones I want input on, what you use, why you think it's best
Lvl 60 Talents: Not much for tanking in my opinion. Burning rush for me.
Lvl 75 Talents: Another one I want input on.
Lvl 90 Talents: None of these really help you survive, so I go with MF to get a bigger area aggro'd so nothing can escape
Obviously Demon Hunting is by the the most important glyph for tanking, that goes without being said.
Soul Consumption: A must for multi target tanking, very useful self-heal.
Siphon life is also a very useful self heal.
The only Minor one I care about is Glyph Of Hand of Gul'dan, making sure you hit as many people with this attack is one of the most important things. Very good dot, very high damage.
It's pretty much the Death and Decay of warlocks.
For Single target fights, like bosses, rares, elites...etc I like to use our amazing Voidlord to tank. When Tanking this way I prefer Soul Link on the lvl 45 talents. Not really for a bigger HP pool, but for the shared healing via Harvest Life. 10k a sec for the voidlord is usually more than enough healing. Voidlord takes just about no damage, and they're good at dodging rare spawn abilities and whatnot. When tanking with your void, you don't HAVE to be in DA form, but if your void drops, you better be ready to insta-summon him again, or you're gonna have a bad time.
For Multi-Target tanking it gets a bit different. Since our voidlords don't have an AOE taunt, it is not my choice for big AOE tanking. Instead I like to go in solo via Sacrifice (20% more HP in tank form, and 2% health every 5 sec, AND 30% increased damage on HoG and a few other abilities) (to get the 20% boost to health, you still must use soul link for your lvl 45 tier talent, otherwise, it's not there) The constant stream of HP from Sacrifice, Siphon Life, and Harvest Life all going on at the same time is what keep us warlocks afloat during these big mob fights.
I feel as though I have this warlock tanking stuff down pretty good, but if you have something you think is better, tell me and I'll give it a shot.
We obviously have more tanking cd's, like our 40% damage reduction, our big mastery cd, healthstones, a self brez (if we keep soulstone on ourselves)
I think we have just about everything we need to be legit tanks. Rather or not we can que as tanks doesn't matter to me. I've saved the group from a wipe about 15 times in dungeons(normal and heroic), and it's probably one of the best feelings ever.
Just let me know what you people think about our tanking abilities, I obviously love it. I think more warlocks need to play around with it and get a feel for it.