I'll second Placebo, Dead Kennedys, and Jeff Buckley...there's a lot of good ones in here, actually.

Converge - Disintegration (The Cure cover)



Filter - Happy Together (The Turtles cover)



Scarlett Johansson - I Don't Wanna Grow Up (Tom Waits cover)



A Static Lullaby - Toxic (Britney Spears cover)