I remember writing about Aptana on this blog about 2 years back

But god , they have grown really bigger over the past 2 years and have support and intellisense support for so many javascript frameworks like mootools , jquery, scriptaculous, ext js1.1 (ext js 2.0 plugin unofficial)

The IDE has also improved in terms of speed ..

They also have an iPhone plugin which looks like a iFrame hack..

Must have for any web coder out there..

Download aptana

Aptana is a robust, JavaScript-focused IDE for building dynamic web applications. Highlights include the following features: Code Assist on JavaScript, HTML, and CSS languages, including your own JavaScript functions Outliner that gives a snapshot view of your JavaScript, HTML, and CSS code structure Error and warning notification.