McDave,
That's a very good point!! I've been there myself and have the TP T-shirt to prove it.
Some of the best information available is directed at compound shooters. Bernie Pelerite's Idiot Proof Archery. The reason that it is so good (apart from Bernie's style) is that most of it comes straight from Len Cardinale. If you can ignore Bernie's style and focus on the information, there is a lot of good stuff in there. The chapter on anticipation is as good as anything I've ever read on the subject. His description of the bridge is straight from Cardinale and is an essential part of blank bale work.
Another good source is from Olympic Recurve coach Larry Skinner. His video is excellent at showing what good alignment is, as is Terry Green's segment on the Trad Gang video.
After you see what good form looks like, video tape yourself. It's very easy to see the big differences. You can also post it here and you will get a lot of good feedback. Some of it is not helpful, but it doesn't take long to figure out who knows good form and can be helpful.
Good form is little more than consistency. It is the ability to exactly repeat your shot time after time. It is not a particular stance or style. That is something that each archer has to work out for themselves.
Many great archers and coaches have worked out a style and some fundamentals that work for most people. They don't work for everyone. It is usually best to start with the generally accepted form and to learn the fundamentals of a good shot. But each archer has to adapt this generally accepted model to their own situation.
That being said, any time with a good coach will save years of effort in developing an individual form. I saved up for six months to be able to spend a weekend with Len Cardinale. It was the best archery money that I ever spent. Just talking to him one-on-one for two days taught me more about archery than I thought existed. I still refer back to the notes that I took that weekend when I run into problems. Len never commented on my style or form and I'm pretty sure that my form wasn't (and isn't) exactly perfect according to the generally accepted model. He watched me shoot three arrows and then began teaching me the process of developing a good shot. I suspect that he only needed one arrow, but watched the other two to be sure. I shot a lot of arrows that weekend while he watched me do his drills and left twice the archer that I was before.
There are a lot of ways to avoid getting good at archery and I've done most of them. Messing with equipment, undisciplined practice, buying the magic arrows or new bow that will instantly make me consistent will use up time and money that could be better served with coaching and disciplined practice.
The point is that each archer has to decide how good they want to shoot and then do the things necessary to get there. If you want to be pretty good and have a lot of fun with it, you can probably get enough information from the internet, some books and a couple of videos. But, if you want a chance of beating Rod at a tournament, you will have to invest a lot more into it. Only the individual can make that decision.
Sorry for the long rant. I hope this helps,
Allen