Travis_Bickle

Off the top of my head, some that stick out for me are

Kroda – A Stormride (Branikald cover)
Krieg – Venus In Furs (The Velvet Underground cover)
Dissection – Antichrist (Slayer cover)
Dissection – Elisabeth Bathory (Tormentor cover)
Der Sturmer – When the Elders Were Still Young (Absurd cover)
Grand Belial’s Key – Doom Generation (Chaos 88 cover)
Anal Vomit – Antichrist (Sepultura cover)
Emperor – A Fine Day To Die (Bathory cover)
Faith No More – War Pigs (Black Sabbath cover)
Immortalis – Countess Bathory (Venom cover)
Revenge – War (Bathory cover)
Fear Factory – Dog Day Sunrise (Head of David cover, though not really metal)
Sepultura – Orgasmatron (Motorhead cover)
Sodom – Iron Fist (Motorhead cover)
Type O Negative – Cinnamon Girl (Neil Young cover)
Type O Negative – Summer Breeze (Seals and Crofts cover)

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“Formerly no one was allowed to think freely; now it is permitted, but no one is capable of it any more. Now people want to think only what they are supposed to want to think, and this they consider freedom.”
-Oswald Spengler-

Unknown Soldier

Some interesting stuff there, Type O Negative were particuarly great at covering stuff and you should've added on their cover of "Black Sabbath" an epic performance.

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Metal Wars

Power Metal

Pounding Decibels- A Hard and Heavy History