PHP Builder (
http://www.phpbuilder.com)
WebMonkey (
http://hotwired.lycos.com/webmonkey/programming/php/)
and of course PHP.net
I am always up for helping people out so if you have some questions feel free to contact me on ICQ: 70930467
I would say the most important things in PHP are classes, db abstraction and regular expressions. With these 3 things you can accomplish pretty much anything.
Almost forgot check out (
http://www.e-gineer.com/) thats a pretty good site too.
-AJ