Lock Notes was made by Veev of Medivh (EU). It was last updated for, If I recall correctly, patch 2.4.0.

I have updated it 3.1, added more spell alerts, and added new spells for WoTLK.
If you have any questions, contact me in game or email me:

Mazahaka of Kel'Thuzad
or
Mazahaka@hackermail.com

Now LockNotes show:

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Friendly Buffs:
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Hand of protection
Hand of Freedom
Eradication
Shadow Trance
Decimation
Molten Core
Backlash
Improved Shadow bolt/Shadow Mastery
Lifetap on fade/remove
(Also, next to showing when Demon armor and Fel Armor would get removed/Dispelled it also shows Soul Link. Yes, I am aware that they are no longer magic effect and cant be removed, but, they can still slip off without my notice, so I did not feel it necessary to remove them.)
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Enemy Buffs:
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Bladestorm
Cloak of shadows
Divine Shield
Shadow ward
Dispersion
Spell Reflection
Anti-Magic Shell
Ice Block
Lichborne
Berserker Rage
Metamorphosis
Water Elemental (Still broken)
Power Word: Shield
The Beast Within
Fear Ward
Grounding Totem
Tremor Totem
Berserk
Dash
Sprint
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Your Resists/Misses
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Plays a sound and shows a small text alert when one of your spells was resisted/missed.
Shows all spells BUT direct damage spammable nukes like:
Shadow Bolt
Incinerate
Searing Pain
Soul Fire
Haunt
and a couple others.
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I have been working on a new addon, MageNotes. It uses the same principle that LockNotes does, but displays Mage spells and alerts, so make sure to check that out!
Please post any bugs and requests in the comments or email me.