I'm not surprised that Notepad++ is the top contender, it's my favourite editor when strictly dealing with PHP.
I am surprised that there's no mention of the Expression Web product line, though I guess thoughts of FrontPage might scare people away. I use it at work, and it's a tremendous departure from the dangerous Frontpage culture. I'd say it's a great competitor to Dreamweaver, so long as you stick to either version 2 or 4. PHP even has some decent integration when compared to other more vanilla editors (after version 1)
I will have to check out this NetBeans phenomenon, seems to have quite a lot of supporters for a product developed in Java.
