Some great nominations so far, many of whom I'll repeat on my own list, which just has to start with Ty Tabor for me...
Ty Tabor
Criss Oliva
Mark McGee (also some of the best hot-rodded Marshall 800 tone I've ever heard when I saw him with Vicious Rumors back in the 90s!)
Vivian Campbell (seriously... Holy EFFING Diver, dude does NOT get enough credit!)
Andy Wood (both Down From Up and A Disconcerting Amalgam are BRILLIANT)
Greg Howe
Shawn Lane
Ronnie LeTekro
Tommy Emmanuel (saw this guy again a couple of weeks ago... dude's a WITCH)
Jimmy Herring
Sonny Landreth
Danny Gatton
Gus G. (much more for Firewind than Ozzy)
Chris Caffery
Chris Poland
Andy Latimer (Camel)
Eric Peterson (where would Testament be without Eric's EPIC riffs?!)
JOE Holmes (WTF ever happened to this guy?! I thought he was AMAZING when I saw him with Ozzy!)
And a big, HUGE +1 to Steffen Schackinger. I bought ElectriGuitartistry a year or so ago, and it's one of the most impressive and inspiring debuts I've heard in a VERY long time, along with Andy Wood's. Both of these guys have a serious future ahead of them and both are phenomenal and very promising young talents.