To name a few...
Billy Gibbons (ZZ Top)
Excellent blues rock player. I'm talking about their 70s period, before MTV got a hold of them. His style is so laid back, you can hear every note he plays has style and feeling in it. Check out Cheap Sunglasses, La Grange, I'm Bad I'm Nationwide, Heard It On the X and Nasty Dogs and Funky Kings to hear what I'm on about. I'm sure I've missed out a few other excellent songs though. He's written some of my favourite riffs and some of my favourite solos. If I were gay I'd let him do things to me.
Dimebag Darrell (Pantera)
Pretty obvious choice yes, but can anyone into metal music really leave that guy out of a list of favourite guitarists? I'll say pretty much the same about him that I did about Billy Gibbons, only a different genre. His riffing skills are second to none, his creativity where solos are concerned and also the skill with which he applies these techniques was amazing. Plus his love for the music he played and his guitars was great to see, I think that's lost these days. Perhaps I'm just a bit more blind to it all now I've gotten a little older.
Marty Friedman (Megadeth)
Any of his solos off Rust In Peace make me stiffen in my underwear. His tone is fantastic, nice and warm and sort of bubbly sounding. Each solo played with utter superbness that it makes me want to vomit...I'll never be that good.
Adrian Smith and Dave Murray (Iron Maiden)
Both their soloing on the Killers album still makes me weep. It's not just half decent music, it's fucking EXCELLENT. Also, Adrians solo on Aces High from Powerslave makes the hair on the back of my neck stand on end.
Steve Vai
He has it all. Skill, imagination, determination, creativity and he's also a showman when playing live...a total poser and very irritating to watch yes, but still puts in a performance.
PS - Kirk Hammett is totally overrated.