Guitar Techniques Magazine. It's an imprt, so it's pricey, 15.99 a pop at Barnes and Noble or Borders...but it is BY FAR the best resource out there. Every month there are great, informative, challenging lessons that have impacted my playing in a big way. No 2 lessons with 10 heavey metal songs tabbed...any transcription they do it's to highlight a specific style or technique. This month Guthrie Govan does a tour de force bending lesson that will kick your tail. if you want to get better and and be challenged, check it out.