Four videos from YouTube. The first one is better viewed on YouTube, because it has important links with pedal settings, etc.
Obviously, shoegaze (and its mellower cousin, dream pop), are close relatives to ambient music. A bit more aggressive, but definitely something that has influenced my own music, and will influence any future ambient guitar music I make. These tutorials help me to understand how to get my desired sound better. And like I said before, to help differentiate my own sound from what everybody else is doing.