List of unique class buffs in Cata.

[Saverem]

Rogue: smoke bomb and to some extent disarm trap

You should probably change the topic to "List of unique class utility in Cata". Most of these go outside the defenition of buffs.

Also, I think power word:shield and power word:barrier shouldn't count on this list, as they're practically just heals with a different mechanic.

The mechanic is unique (Damage mitigation as opposed to healing) to the Priest class and it stacks with heals, so it counts.

[Aeriel]

Soulstones were supposed to be redesigned to act like Battle Rez, but I don't know if they ever did it.

Hunters can bring many of those buffs based on their pets secondary (family) abilities. Granted most of the "buff" abilities require Beast Mastery.