A couple of months back, I took a Tuning class that was among the best money and time I spent for my current turbo project. It was tuning seminar taught by the master tuner Ben Strader (some may have noticed my Sig). He has started EFI101 University, a place where professionals and hobbyists alike can come together and learn the principles of properly tuning engines for power and drivability.
He has just started a forum dedicated to this as well so I invite anyone who has relevant questions, knowledge and experience to come over and learn or contribute.
Happy tuning!