I went to see Santana with my son last Saturday night, and I can tell you that 67-year-old Carlos Santana is still the man on the guitar. 2-3/4 hours of straight guitar and percussion goodness.
But my new guitar fav's are probably Rodrigo y Gabriela, Mexican guitarists who went from street musicians to stars in Ireland. Here is Diablo Rojo
And while we are on guitarists, I can't help but give a shout out to fellow Princetonian Stanley Jordan, still the most amazing thing, technically, I have ever seen on guitar. If it looks like he is playing piano rather than the guitar, that's because his original training was on the piano. When playing piano, all one is doing is causing strings to get hit. He wondered why he couldn't just do it directly. Skip to about a minute in if you are impatient:
Or watch him playing two guitars at the same time in Stairway to Heaven around the 4:00 mark (Jimmy Page had his two-neck guitar but never played them at the same time!)