Add Joe Pass, Warren Haynes and Al DiMeola. To tell me Mick Ronson is a better guitarist than Al Di renders this list suspect.
I'm not saying Mick Ronson is better than Al DiMeola but I bet more people are familar with his music. He did some pretty cool stuff with Bowie and, I believe, he was very highly ranked in the 70's (somewhere between Clapton and Page). I don't agree with the rankings but Ronson was a cool guitarist back in the Glam days! His playing and style complimented Bowie during one of his most interesting musical periods. There is nothing technical about his playing on this one but this song still gives me chills!
http://www.youtube.com/watch?v=5g6--QoPsDM&feature=relatedLastly, there have been lots of great guitarists over the years and probably quite a few great ones who never became famous. I'm a fan of many of the guitarists in this thread and on the RS list but can't envision a time, in my lifetime, in which anyone but Hendrix deserves the crown. IMO, he is the king and most influential guitarist of all time, and should not be on the list because the gap between Hendrix and all other 99 players is too wide.
Cheers,
Jack
PS - I've seen Al DiMiola live a couple times and his playing, every time, was mind boggling. I am a hugh fan and was at the Paco DeLucia. John McLaughlin concert when I was in college. Amazing players!