If not I'm thinking I'll make one.
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EDIT: Sorry, hijacking this post so the latest info is kept at the very top for easy reference. -Sam

EDIT: Summer '07 updates in BLUE
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Here's what we have so far; of these, it seems only +Attack stacks; the rest take highest value (like focus effects):
Critical Damage Mob:
Slot 10: 110 - Shaman 2.0, Prophet's Gift of the Ruchu (own group only)
Slot 10: 70 - Shaman 1.5, Fateseer's Boon (own group only)
Increase Accuracy:
Slot 12: 140% - Bard 2.0, Spirit of Vesagran (own group only)
Slot 12: 130% - Bard 1.5, Kinsong (own group only)
Slot 2: 45% - Ranger, Auspice of the Hunter
Slot 10: 40% - Shadowknight 2.0, Lich Sting (own group only)
Slot 10: 30% - Shadowknight 1.5, Reaper Strike (own group only)
Increase All Skills Damage Modifier by:
Slot 9: 30% - Berserker, Bloodthirst Effect (own group only)
Slot 4: 10% - Shaman, Champion
Slot 7: 5% - Shaman, Spirit/Talisman of Might
Slot 7: 5% - Druid, Lion's Strength
Increase Attack:
Slot 7: 243 - Beastlord, Ruthless Ferocity, Rk. III
Slot 7: 234 - Beastlord, Ruthless Ferocity, Rk. II
Slot 7: 224 - Beastlord, Ruthless Ferocity, Rk. I
Slot 7: 150 - Beastlord, Ferocity
Slot 3: 140 - Shaman, Champion
Slot 2: 90 - Ranger, Howl of the Predator
Slot 11: 60 - Berserker, Ancient Cry of Chaos
Slot 1: 60 - Ranger, Strength of Tunare
Slot 6: 15 - Shaman, Spirit of Bih'li
Slot ?: 50 - Offense Enhancement (Group Leader Ability)
Slot ?: 50 - Offense Enhancement (Raid Leader Ability)
- any more?
Increase Chance to Critical Hit by:
Slot 5: 120% - Circle of Power III Effect (Hybrid Click) (own group only)
Slot 1: 100% - Berserker, Cry Havoc (own group only in practical use)
Slot 4: 90% - Ranger, Auspice of the Hunter
Slot 5: 80% - Circle of Power II Effect (Hybrid Click) (own group only)
Slot 11: 65% - Shaman 2.0, Prophet's Gift of the Ruchu (own group only)
Slot 11: 50% - Shaman 1.5, Fateseer's Boon (own group only)
Slot 5: 40% - Circle of Power I Effect (Hybrid Click) (own group only)
Slot 6: 20% - Enchanter, Hastening of Salik
Increase Chance to Hit by (with All Skills):
Slot 5: 5% - Rogue, Thief's Eyes
Increase Chance to Riposte, Parry, and Block:
Slot 3: 10% - Monk, Master's Aura Effect
Increase Double Attack by:
Slot 4: 6% - Monk, Fists of Wu (own group only in practical use)
Slot 3: 3% - Ranger, Howl of the Predator
Increase Dual Wield (by):
Procs:
Slot 5: (400) Add Proc: Panther Maw rate mod 400 - Shaman, Spirit/Talisman of Panther (own group only in practical use)
Slot 1: (100) Add Proc: Storm Blade Strike rate mod 400 - Bard, Storm Blade (own group only)
Special Haste-like Stuff:
Slot 2: Hundred Hands Effect - Berserker, Ancient Cry of Chaos (own group only)
Overhaste v3:
Slot 2: 30% - Bard, Eriki's Psalm of Power (own group only)
I'm sure I'm missing some +Attack stuff if nothing else; does anyone know what Offense Enhancement 3 gives? What else am I missing?
So, for maximum burst DPS, it looks like Bard, Berserker, Monk, Rogue, Shadowknight and Shaman all have own-group-only buffs, and that the other buffs can be cast on such a group by non-group Enchanter, Beastlord, Ranger.
Note that I'm not saying this is the optimal group to benefit from these buffs; it has been suggested specifically that the Shadowknight buff doesn't bring enough to the group to compensate for having a Ranger or another of the others in the group, who would get more mileage out of the remaining buffs. Thoughts?