Marc Seal Guitar Tutorial 3 (Part 2 of 3): Teaches you how to you pitch shifter and octave effects to create cool sounds and the 'Mail Bag' section teaches you how to find notes on the fingerboard.
Marc Seal Guitar Tutorial 1 (Part 3 of 4): Sound Advice In this tutorial he teaches you how to get the vintage tone used by Jimi Hendrix or Stevie Ray Vaughn
Marc Seal Guitar Tutorial 4 (Part 3 of 4): Gives you a sound advice of getting a nice tone with a pitch shifter effect. Also, teaches you how to do natural harmonics on any fret.
Marc Seal Tutorial 7 (1 of 3): Teaches you how you can arpeggiating chords, i.e. pick the individual strings and also he goes through different time signatures as well