Watch the Jazzy Jeff online guitar lesson by Jeff McErlain from Essentials: Solo Electric Blues
There are so many great jazz guitarists throughout history that sometimes it's hard to know where to start. Charlie Christian is a great guy to listen to as he is one of the earliest and most influential. Of course Wes Montgomery is high on the list for obvious reasons as he helped define the guitar in jazz. George Benson is another monster player, especially his earlier work, when he was playing more straight ahead jazz. I chose these three right off the bat to check out as they are well known, amazing, and influential. There are many other names like Pat Martino, Pat Metheny, Jim Hall, and Joe Pass to name a few.