NETBEANS 6.5 with php and jquery support is superior for Yii development. You have all core php code completion, yii classes code completion, jquery code completion and now with the nighlty build you can declare that the $this variable in view scrip files is of type "CController". I think it is amazing
Netbeans is nice, but the code completion does not always work for me. For example, typing
in the controller, does not display a list of possible functions or members. Sometimes the code completion works, but it could work a lot better for me. I used to use Eclipse for my Java projects a couple of years ago and it was excellent. I somehow cannot use the 64-bit bundled version of PDT Eclipse in my Gentoo Linux, so I have to user Netbeans, which works smoothly. The only complaint I have for Netbeans 6.5 is the code completion feature.
I also suggest everyone mentions the OS where they use their favorite PHP editor. In my case, it's 64-bit Gentoo Linux and Windows XP, so my needs is for a cross-platform PHP editor.