Ultimate-Guitar.com – has a large collection of songs, so if you don’t find what you’re looking for on bestbeginnerguitarlessons.com this is the site to go.
JustinGuitar.com – A great guitar instructor, Justin has helped me in a number of ways. Fantastic video lessons.
Chordie.com – has proven also a great guitar song resource offering chord-based musical notation.
Guitartabbooks.com – Here is a Free Online Guitar Lessons, Sheet Music, Instruction Books, Videos, and Online Music Store by Billboard’s top rated instructor, Scott Morris.
TheGuitarLesson.com – Good Beginner video guitar lessons offering on-screen tabs and chord charts.