I'm just starting to look at the PHP videos at Lynda.com, so I can't really speak to how well they cover the Dreamweaver/PHP subject specifically. I will say I wish they had a few more selections for it. I started watching one, and got hung up at the point where the instructor has you write a new variable in the path of windows vista system variables. It was supposed to make it so you could see your mysql connection when you typed in "mysql" in the cmd prompt window. However, it didn't work when I changed the path (I suspect it is because the path already was changed by IIS 7 when I tried to get that working, it never did so I switched to xammp). So, since it wouldn't work the way he said it would, I thought my local testing server wasn't going to work. I ended up watching a david powers tutorial on setting up a phptesting site in dreamweaver, and lo and hehold, my testing server worked for that!
I thought that was GREAT news, except when I tried my testing server with a real site--not working. This is all such greek to me. So I am still working on it.
BUT, I will say about Lynda.com in general, I subscribe at home, and we have a multi user subscription at work. We find the tutorials in general for all the adobe products to be incredibly valuable. I wish they had some on WA products, but it is still worth it for the other products.
Here is my wishlist for WA: chatroom support like Hostgator has (doesn't have to be 24 hour, open till 8pm west coast time would be great). Forum support has not been very efficient for me. I appreciate the answers I get from the WA team like Jason and Eric, both of them are great and really do help. But it often takes hours to get responses (understandable in this environment) and I think it has to be hard for them too, because how do you track what you have tried and what you haven't with several customers over hours instead of minutes? The hostgator tech support has helped me in minutes to find answers to problems, and I think they are able to do so because it is all right there and you go back and forth until you find the answer. With talent like Jason and Eric and the others here, I think it would actually be a HUGE help to them too. I just don't think the forum is an efficient way to do tech support for either the customer or the techs. Hopefully they will be able to go to live chat at some point. If they do it for sales, for people who haven't paid anything yet, I would hope they could do it for those of us who have put our money on the table. Just a thought.