Free Guitar Lessons at Guitar Dreams
Guitar dreams has a lot of info about guitar lessons. The site also has a guitar forum and guitar tutorials. As for the guitar lessons, you'll find categories like alternate picking, melodic concepts, string skipping, tapping, legato, arpeggios and many more. There are also some guitar exercise for you to practice. You may submit you own lesson or riff to the site if you like to contribute some of your guitar knowledge. The site doesn't seems to be that professional but there are still lots of free guitar lessons that you can learn.