rationalskepticism.org

Since Grim brought up Stevie Ray -
Voodoo Chile
[youtube]http://www.youtube.com/watch?v=h94M_jTD4kY[/youtube]
Doesn't surpass the Hendrix original, more of a tribute.
Hendrix:
http://www.youtube.com/watch?v=WoAXW30mMAg

And while on the subject of Jimi (and Mr S brought up the subject of Dylan covers above), why not one of the greatest covers?
[youtube]http://www.youtube.com/watch?v=bng3agUOYiI[/youtube]
Dylan's version, live:
http://www.youtube.com/watch?v=Cbcu9KNbWNY