Guitar Foundation of America – great site for classical guitar. Information, articles, and links all related to the classical guitar.
Hill Guitar Company – Kenny Hill is “crushing” it related to guitar construction. He is pushing guitar construction forward in the 21st century. I play a 2012 Signature Spruce (double-top/lattice-braced/elevated fingerboard) and am a Hill Artist.
Mel Bay Publications – publisher of pedagogical music resources.
Shubb Capos – great capos that allow you to adjust the tension placed on the strings/neck.