I'll throw you a few that haven't been mentioned much here:
- Jimmy Thackery (formerly of the bluesrock band The Nighthawks)
- Johnny Winter (in his prime - untouchable)
- Billy Gibbons (at least 5 ZZ Top albums should be in every Stones fan's collection)
- Derek Trucks (currently the best slide guitarist on the planet - Duane is barely missed these days in the AB

- Warren Haynes (he's playing second fiddle to Derek now, but he's the busiest guitarist on the planet - anchoring 3 or 4 bands at a time)
- Trey Anastasio - brought jam banding back from the "dead"
- Leo Kottke - the best in the biz, still
- Charlie Christian & Django Reinhardt - still amazing to listen to after all these years
- Wes Montgomery - jazz guitar at its absolute finest
- Jerry Garcia - the man was a marvel