It's going to be by class rather than mob. Any mob of a given casting class is going to have the same spells as any other mob of the same class and level.
Paladin
Divine Favor: Level 55 Kunark
[Mon Jun 28 11:57:39 2010] Reklon Gnallen begins to cast a spell.
[Mon Jun 28 11:57:40 2010] Reklon Gnallen is surrounded by an aura of Divine Favor.
Divine Strength: Level 60 Velious
[Tue Jul 13 00:35:33 2010] Datur Nightseer begins to cast a spell.
[Tue Jul 13 00:35:35 2010] Datur Nightseer begins to radiate with divine strength.
Shadowknight
Shroud of Hate: Level 35 Velious
[Sun Jul 11 18:44:49 2010] Solusek kobold king begins to cast a spell.
[Sun Jul 11 18:44:50 2010] Solusek kobold king regains concentration and continues casting.
[Sun Jul 11 18:44:50 2010] Solusek kobold king has been strengthened by hatred. <-
Differentiation from Shadow Vortex text.
[Sun Jul 11 18:44:50 2010] Rawlzec is washed over by a wave of shadows.
These are what I've encountered in addition to the spells listed above.
Also, NPCs are buffing far in excess of their classic-velious, live counterparts.
The logic on live would only allow for: SoW, buffs that directly increased HP (Self only shieldings, symbols, HP type one, Talismans, but not stamina buffs), hastes, damage shields, and runes.
It may be that these limitations were what kept bards from working on live, and that in making bards to function, it has opened the floodgates for NPCs to cast every buff at their disposal, including resistance buffs:
(Mobs that have resistances that seem off, maybe be due to buffs)
[Sun Jul 18 03:31:29 2010] Fire goblin wizard is surrounded by a brief bovine aura.
[Sat Jul 10 11:28:35 2010] Greater kobold shaman pet is resistant to disease.
[Sat Jul 10 11:28:43 2010] Greater kobold begins to regenerate.
[Sat Jul 10 11:28:50 2010] Greater kobold shaman pet looks healthy.
[Sat Jul 10 11:28:58 2010] Greater kobold shaman pet feels much faster.
[Sat Jul 10 11:29:06 2010] Greater kobold shaman pet is surrounded by a shifting spirit shield.
[Sat Jul 10 11:29:13 2010] Greater kobold shaman pet is surrounded by a brief lupine aura.
[Sat Jul 10 11:29:21 2010] Greater kobold begins to regenerate..
[Sat Jul 10 11:29:31 2010] Greater kobold is surrounded by a brief lupine aura.
[Wed Jul 07 18:11:13 2010] Ezmirella looks tranquil.