Sorry if this is a stupid question, but I am new to the resto tree. With the changes in threat in WtLK, is sublety necessary? I'm currently doing 5-mans and heroics, but want to get into 10-mans.

If a tank has threat then a healer shouldn't need 30% less to not pull off the tank. If the tank has no threat then having 30% less will still put you over the tank, either the mob will still go after you or pick another healer who is above you.

I started 2 drake sarth without threat reduction then specced into when I died all the time. Even with it I still died to pulling threat on adds, it really made little/no difference. Part of that was due to our group make up, 2 prot wars and pally healers but the only way I could stay up with warstomp/BoP.

Well... while I agree its rarely that I have threat issues unless you have some kind of combination of addspawning and really spamming lots of people with heavy healing I dont really see what you take instead of subtlety. Is it for 3/5 Tranquil Spirit you wish to drop subtlety? Cant say I have evaluated that talent to further extent in wotlk but it really feels like a small managain to trade the times where threat is sensetive. 30% could be the diference in one attack or two attacks a tank has to get off to get an add off your bank, meaning it could also be the diference in one or two swings that add aims at you rather than the tank. But to be fair it is just a hunch of mine. Untill Im starting to feel really pressed for mana I´m not going to investigate Tranquil Spirit.

Regarding Shadowmeld there is another neat trick to it that applies only to 5 mans. While raiding one of the druid mana tricks is to use your inervate early enoughe to get two in one fight. However in 5mans the trick is to pot early and use shadowmeld immediatley after since that starts the pottimer and in another minute you get to use another pot. So even if you havnt built up your mp5 and manapool for real durability yet (or if you´re healing a crappy tank you can squeeze two pots and an inervate on nearly all bosses if you time them right. (put simply chainpotting isn´t dead for druids.) For alchemists you can also extend your durability the middleway, I play a bit with people who like speed and chainpulls, but chainpoting runics would really be overkill even with my current crappy gear so I use the shadowmeld trick together with endless pots wich most of the time gets me right over the top where I dont haveto stop and drink anywhere for speedy clears.

Not to dispute that you personally saw no difference, but on paper the benefit would be that tanks who are trying to pick the adds up primarily with AOE threat abilities (consecrate, pestilence, thunderclap type stuff) the less threat you generate the more easily they will peel mobs off you. I agree that once they have them its unlikely the talent will change whether or not you pull them back.

I'm in the camp that there's no place else worth putting those points to move down the tree compared to Subtlety at the moment.

MMO-Champion BlueTracker - PTR Patch 3.0.8 Notes
Nourish, which spell I use quite a lot now that I have been convinced of the awesomeness of 4T7, enough to go away from Glyphed Regrowth for tank spamming and try out Innervate and Rejuvenation glyphs, is now officially in the awesome ballpark. I'll hate it when it will fall down to shitty/without a large enough niche to fill once again after breaking the T7 bonus (*for tank healing anyway, it will be a cool Flash Heal spell with WG boosting it.. but only on players affected by WG).

Mana was not really the issue with Nourish although it is a very nice change to have available - it needs a slight strength boosting talent thrown in to soothe concerns and making people get used to a new spell only with 4t7 making it truely superior is not a smart way to do things.

And tranquil spirit is the talent to do it. It's hideously underpowered compared to moonglow now.

There was never any major disparity of HPM between them both (4t7 edged slightly better HPM) though when you assume the direct heal only.
I think they will save the Glyph for when it is unlikely we will still be using 4t7 as to keep it somewhat balanced and have it doing roughly the same boost to healing.. which is why an inclusion to a power boosting talent would be appreciated to get it up there.

Taken from the newest PTR patch notes for 3.0.8, found at MMO-Champion BlueTracker - PTR Patch 3.0.8 Notes

I'm not currently on the PTR, so I don't know how big of a reduction this will be for Lifebloom's mana cost, but I would assume that this is to help try and balance out the Rejuv Idol that drops in Naxx25, possibly because Rejuv is just too long lasting/heals for too much when left on the raid to heal up incidental damage? Although, I am going to be really sad if this makes Rejuv cost more then Lifebloom again. I have been getting quite fond of that and don't use Lifebloom nearly as much anymore.

While i do think the same as far as the missing glyph is concerned (that it should be supplied, and it should somehow be balanced to counter the somewhat overpowered Regrowth glyph), i oppose the idea of a spell needing a supporting glyph in order to be considered. Right now the balancing should be happening within existing talents. Only 4 (5 with the change in 3.0.8) talents mention Nourish explicitly, 1 (2) of them reducing the mana cost, 1 reducing interrupt effects, 1 providing a small spellcrit bonus and the last one only listening the spell as possible proc spell. That leaves a somewhat lacking feeling of support through specialization talents. Herein lies the main opportunity of a workover regarding Nourish, not in supplying a glyph, without (as with missing 4T7) the spell would be a weak alternative again.

I was looking at Imp. Tranquility, Living Seed or Nautural Perfection for the 3 points. Here's the spec I was looking at with the 3 points taken from subtlety. Note sure if I've taken some less-than-optimal talents.

Talent Calculator - World of Warcraft