There's two new posts that look at an up and coming PHP IDE (really a PHP plugin for an existing IDE) - NetBeans - one from Mike Borozdin and another from Juozas Kaziukenas.

Here's some of Mike's comments:

NetBeans is mostly known for Java developers as a good and free IDE. At the same time recently NetBeans started supporting other languages, like C/C++, Ruby and finally PHP. Moreover it not only supports plain PHP, but it offers quite good support of HTML and JavaScript. [...] Generally, I feel pretty good about NetBeans. It seems to be working much faster than Eclipse, both in terms of the loading time and in terms of code editing and code completion as well.

And some thoughts from Juozas:

I find more more articles about NetBeans 6.5 IDE for PHP, for example this Mike's article. Why people like it so much? After some weeks spent reading all these articles, I finally decided to throw away all other editors and try new-and-shiny NetBeans. [...] Overall it's just a wonderful tool - stable, helpful and being actively developed. Give it a try!