Originally posted by Inisfail
I would suggest:

John Petrucci - Rock Discipline

The DVD (go for that one, not the VHS) really helps in almost any ways.. That's it!

John Petrucci, the father I never had. That guys videos describe everything that's essential. The biggest shortcut ever to rock stardome. Finally somebody who doesn't beat around the bush technical-wise and who is fairly intelligent when it comes to instructing. Only question I have is if his videos come with notation of the exercises he shows.