Last year I happened upon a band named Chon from California. They blew me away with their insane shredding and surprisingly well-written, original songs. And what's even more amazing are the ages of the members. At the time of their demo release last year both of the guitar players were 16, their bassist was 14, and their drummer....only 12. Here is a video of them shredding live (they don't really start til about a minute in):
Watch out for these kids in the coming years. They are only going to get more talented and I could definitely see them getting big. Also check out their Myspace and Purevolume to listen to and download their songs.