[lkastonidwedsrer]

worst:

Avril Lavigne's two that were already mentioned
The Darkness - Bohemian Rhaposdy

best:

Dream Theater - Achille's Last Stand (Zep)
TooL - No Quarter (Zep)
Tori Amos - Smells like Teen Spirit (Nirvana)
Ben Harper - Whole Lotta Love (Zep)

Probably a lot more that I can't think of right now. I hear Evanescense's new cover of Heart Shaped Box is pretty good.

Peace.