Protoss

Probe - Proximity Mine (Chaos Quake 2 / Chaos Unreal Tournament)
Zealot - Gideon (Blood 2)
Dragoon - Xan Krieger (Unreal Tournament)
Templar - Ishmael (Blood 2)
Archon - The Voice (Blood / Blood 2)
Observer - The Autobot Matrix (Transformers)
Scout - Zealot (Blood 2)

Terran

Announcer - Gabriella (Blood 2)
SCV - Peasant (Warcraft II)
Civilian - Cultist (Blood 2)
Marine - Fanatic (Blood 2)
Firebat - Caleb (Blood 2)
Ghost - Chrono Legionnaire (C&C: Red Alert 2)
Vulture - Garret (Thief / Thief 2)
Goliath - Prophet (Blood 2)
Seige Tank - Guard (Thief / Thief 2)
Dropship - Cabalco Intercity Transit (Blood 2)
Wraith - Alarik (Unreal Tournament)
Battlecruiser - Ash (Evil Dead / Army of Darkness)
Science Vessel - Mad Scientist (Blood 2)

Zerg

Announcer - Duramoth (Filtered Zerg Overmind)
Larva - Bone Leech (Blood 2)
Egg - Evil Hand / Gideon Transformation Sequence (Blood 2)
Overlord - Death Shroud (Blood 2)
Drone - Peon (Warcraft 2)
Zergling - Shikari (Blood 2)
Hydralisk - Korax (Hexen)
Ultralisk - Drudge Lord (Blood 2)
Scourge - The Evil Dead (Evil Dead / Army of Darkness)
Mutalisk - Soul Drudge (Blood 2)
Guardian - Drudge Priest (Blood 2)

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The Brood War units and sounds have not been modified.
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A bunch of buildings have new sounds.
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Some attacking and other sounds are also new.
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Ling tails will be loud if unsuccessful. Watch out for successive nukes, too.