I need advice for converting my skills to PHP.

I am a small website developer who does 2-3 sites per month. I develop using Dreamweaver CS3 mainly in ASP/VBScript and usually tie into an Access or MSSQL database. I am proficient with Ajax and Javascript as well. I know that I need to become proficient in PHP as it is in wide use.

My question is where do I start? I obviously won't convert existing sites, but I would like to start some of my new projects using PHP. Can you please give me direction on where someone with my background should get started. What are some good books? websites? Tutorials?. I'll take the time to learn, I just feel overwhelmed on getting started.