Here's my list of top slide guitar players: Eric Clapton, Jeff Beck, and Jimmy Page. Duane Allman. George Thorogood. Adrian Belew. George Harrison.
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"A Festivus! For the rest of us." -- Frank Costanza

Billy Gibbons
Bonnie Raitt
Johnny Winter
Earl Hooker
Muddy Waters
Buddy Guy
Ry Cooder

Both good lists! :)

Jeff Healey (George Harrison even played with him on his cover of "While My Guitar Gently Weeps)

Honorable mention - the Eagles's Don Felder