Not really into the ppc game. Like my traffic free for now. Though I have a little experience in PPC. Best resource I came across while doing my research was ppc-coach.com. It's a forum you pay about 50 a month for I think. They have a lot of good Info on there. Probably won't find as much stuff psychology, but if you are that advanced that the forum can't teach you anything. Hook up with the big players there. Know there are people that have there xxx% to xxxx% ROI PPC campaigns over longer periods of time there.

Hope this helps