Some of my favorite cover songs are:
the Greatful Dead-- "Devil with a blue Dress on/Good Golly Miss Molly"
White Zombie-- "Children of the Grave" (Black Sabbath)
Rob Halford and Fight--"The Wizard" (Black Sabbath)
Wrathchild America "Time" (Pink Floyd)
Tori Amos "Smells Like Teen Spirit" (Nirvana)
Ozzy Osborne live on
Speak of the Devil "Never Say Die" (Black Sabbath) (yeah, Ozzy covering himself

)
Jimmi Hendrix --"Killing Floor" (Howlin' Wolf)
Jimmi Hendrix and John Lennon "Day Tripper" (the Beatles)
Jimmi Hendrix "Hoochi Coochie Man" (Willie Dixon)
Jimmi Hendrix "Hey Joe" (Billy Roberts)
Jimmi Hendrix "Hound Dog" (Leiber, Stoller and Elvis)
The Who "Shakin' All Over" (Johnny Kidd and the Pirates)
Led Zeppelin "Traveling Riverside Blues" (Robert Johnson)
Led Zeppelin "Whole Lotta Love" (originally Willie Dixon's You Need Love)
Led Zeppelin "When the Levee Breaks (Kansas Joe Mcoy)
Led Zeppelin "Bring it on Home" (Willie Dixon)
Led Zeppelin "Gallows Pole" (LeadBelly)
Covers I don't Like:
Jessica Simpson "Take My Breath Away" (Berlin, I think)
Metallica "Turn the Page" (Bob Seger)