Watch the The Edge online guitar lesson by Jeff McErlain from Kings of Tone
The Edge has one of the most instantly recognizable tones ever. OK I think you have picked up on the fact that I am a fan, but I wasn't really a U2 fan until I saw them live, I highly recommend it. I didn't appreciate his guitar work until I started producing music and backing up singers. He creates a mood and a centerpiece riff but never gets in the way of the song or singer. Just listen to Where "The Streets Have No Name" closely to hear what I am talking about, in fact listen to any U2 song for an amazing example of what I am talking about!