An excellent article on practicing...very cool stuff in here...
LEARN GUITAR THE J.U.S.T.I.N. WAY - LEARN TO PLAY THE GUITAR with JUSTIN (online lessons & videos) wonderful online guitar course for beginners. But the J.U.S.T.I.N. method is the most effective method and fun available anywhere. The site includes loads of step-by-step playing lessons, videos, and a systematic learning method.
Wanna teach yourself guitar? This dude is the man!