I downloaded NetBeans IDE 6.9.1, just to compare against eclipse PDT 2.2.0 to edit PHP projects on CVS.
Eclipse can appear complex and difficult to setup, however, by downloading eclipse PDT all-in-one it is easiest to unzip it and start using it.
I'm surprised about how fast and light weighted NetBeans is, you can realize how fast it is immediately.
I still like eclipse on the way how it does and shows stuff, but NetBeans has a crispy design.
They both are really good options regardless of Linux or Windows OS.