Edit (5/9/09): As guilds progress through Ulduar, Wowhead updates its list of loot. As such, there are some items that have been datamined but that Wowhead hasn't put up yet, so no links yet.
From the new list generated, it's clear to see that certain Trinkets pull out ahead of others -
[Spark of Hope] seems custom made for Druids, as we're throwing SOMETHING out every GCD. Rough math shows that we'll get approximately 210 mp5 from this trinket from the effect alone, nevermind all the Spirit on it. Unfortunately it calculates the mana reduction before Tree Form, so we don't get to double dip for a full effect.
I would say that if you're looking at
[Eye of the Broodmother], pass it to some DPSer or other healer and get them to run OS25 with you.
[Illustration of the Dragon Soul] still drops off Sarth without ANY drakes up, which is 10-15 mannable for a guild in Ulduar, and frankly, it's better for Druids than the Eye. We scale MUCH better with straight SP than with Crit, while other classes can use both. No, I'm not telling you how your guild should loot. But really, Illustration is EASILY farmable, and any Resto Druid who doesn't have it should be pressing their guild (or anyone they have on their buddy list) to farm OS25 no drakes for it.
The other new trinkets (save for Sif's Remembrance) are kinda lackluster. Best in slot looks to be Illustration + Sif's (ignoring the one off Yogg 25 since Wowhead is lame). Is anyone else excited about the PVP Trinket effect on a PVE item? Not that we've come across an encounter with that yet, but it's nice to have on hand.
Original Post (11/25/08): I was debating adding a list of quest rewards, but frankly, there's nothing terribly unique about any of them - Equip: +Haste, Use: +Spell Power, or vice versa, generally. Some have Stats instead of an Equip bonus. Nothing gamebreaking though. This list also only lists items with a iLevel higher than 156 (save one, mentioning later) - we all know the greatness that is Memento of Tyrande or Glimmering Naaru Sliver.
One thing that I'm noticing is a severe lack of straight +Spell Power trinkets like Essence of the Martyr. This worries me a bit, only because the alternative is Crit/SP or Haste/SP trinkets, which aren't necessarily "ideal" for Druids. Anyway, a quick run down from my perspective:
[Je'Tze's Bell] is like Memento of Tyrande on drugs. Unfortunately, it appears to be a BOP World Drop. Grats to any Rogues who find this.
[Illustration of the Dragon Soul] is another one that I'm looking towards...mostly because it's straight Spell Power though.
[Talisman of Troll Divinity] seems horribly itemized. Direct Spells generally mean Pallies and Shammies, who get the least out of Spirit of all the healers.
[Soul Preserver] is the new Eye of Gruul - now that we have an AOE Heal, I wonder about the proc rate chances. Spirit is also prevalent on more trinkets then I would have expected. It seems Blizzard is focusing on more regen from your trinkets rather than straight output.
All three Darkmoon Cards listed are ones that I'm keeping my eye on. IMO, they're the most unique out of all the trinkets currently implemented. For
[Darkmoon Card: Greatness], Spirit is the most obvious choice - bonuses to SP while in Tree Form, and nice regen whenever it procs.
23:11:54 called in wowhead_item::start:324 Item not found!
is interesting because I've heard rumors that if you right click the bubble off, you gain an instant 1200 mana. Could also be useful for fights where you can't spare a GCD on yourself (admittedly, less of a problem now that we don't have a 7 second cycle). Also, 400 damage seems miniscule compared to the aoe we can reasonably expect in raids in the future.
[Darkmoon Card: Blue Dragon] is a Trinket that I got earlier in the year when I was having mana problems (early t4). It served me well until the Alch Stones removed any mana problems whatsoever, but I'm thinking of bringing this back into my main set. With the nerf to chain potting, the alch stones have lost almost all their usefulness, in my opinion. Just some rough testing in 5 mans shows that the proc rate is still the same as I'm leveling to 80, but as I get more Spirit on my gear, I'm expecting the mana returns to be something close to ridiculous. Something I'm playing around with, but I'm really expecting it to pay off if I find myself with mana problems at 80.
I moved this commentary from the OP to this post.