SpellLock

SpellLock tracks spell school lockouts on enemy player targets by you or members of your party. It also tracks cooldowns for spells that cause lockouts cast by enemy players in the arena.

It has the option of using DBM for warnings and bars in addition to (or instead of) the built-in bars. SpellLock can write to party chat when a lock occurs.

You can access the options through the blizzard UI or by using "/slock"

New in 1.2.1 beta, tracking of silence effects!

Tracks:
Counterspell
Kick
Mind Freeze
Pummel
Spell Lock
Wind Shear
Shield Bash
Deadly Throw
Rebuke
Shambling Rush
Pummel - Gorilla
Serenity Dust - Moth
Nether Shock - Nether Ray
Skull Bash - Cat
Skull Bash - Bear

Silences
Strangulate
Silence
Silencing Shot
Imp. Counterspell
Garrote
Improved Kick
Gag Order
Avenger's Shield