A really good guitar blog that I have come across recently is called IGblog it has some really good guitar lifestyle material worth checking out.

One of the most notable things about the blog is that there is a series going on right now dealing with the Caged chord system, definately worth checking out.

The idea behind the Caged system is that you can play any Chord in 5 different shapes. So for example If you know how to play a D chord, you can also play that chord in 4 other positions up the neck, but when you do it each one will be in a different shape the Shapes are C, A, G, E, D

So you can play the D Chord in the A Shape, or in the C shape.. anyway go check it out