Helpful Links

I haven't really gone over the basics of how to start training for perfect pitch, as I assume that most people here have given Burge's course a decent shot. If you don't want to get his course though, here are the links to the most helpful tips I've found online regarding starting out. They are primarily for bass players, but a lot of the principals will work for the guitar as well as other instruments. In general this guy just gives good ear training advice.

http://www.notreble.com/buzz/2009/10/22/the-zen-of-ear-training-part-1/

http://www.notreble.com/buzz/2009/10/29/the-zen-of-ear-training-part-2/

The only thing I would personally change about his advice is the part about using a metronome. It is very helpful to play tones in different rhythms repeating them a certain number of times, etc, (often I'll play a note and then softly count 2, 3, 4 in my head for example) but personally I would find a metronome distracting. I could see how some people would find it helpful though. Good luck as you continue training!