I have used notepad++ for most of my PHP needs over the years. I like how light weight and fast it is. I edit most of my PHP remotely from multiple machines so it is nice not to have any files locally to perform editing.

After reading this article I tried NetBeans; wow slow! I like some of the features but I do not like the fact that it requires you download every file from the host machine when first building a project. I am going to stick with notepad++ and my trusty FTP client for now.