@kaloschke, Unfortunately I don't get syntax highlighting in SS files, I just meant within my PHP Classes. Aptana does read my open SS files and provides any element ID's and Classes to the CSS code completion, which I thought was a nice touch.
I always thought Netbeans was for Java. Is there a PHP plugin or something? As it seems so popular I would be tempted to try it, but does it have:
* Integrated SVN
* Synchronization with remote servers
* Code completion that easily detects all classes in your project
If the answer is yes I will happily give it a go :)
Also NetBeans scans all your code so you can Ctrl+click on any class, member, method, etc you use and it takes you to the declaration AND the code hinting will show the args/docs. Many IDEs do this but few do it so seamlessly with both custom classes as well as built in PHP functions.
Don't forget snappy built in SQL database browser/querying also.
I wrote up how I use rsync in Netbeans to automatically sync files remotely on the wiki: http://doc.silverstripe.org/doku.php?id=tools:netbeans
There is a trick!
The instructions that PatJr described may work for some users but there are two different files that Dreamweaver can pickup.
Dreamweaver first looks for the Extensions.txt file in hard disk:\Users/username/Library/Application Support/Adobe/Dreamweaver CS4/Configuration so this is the actual location you need to edit
This help article from Adobe is OK and could help you if there are any hiccups.