For the longest time I've used Zend's IDE for editing my code. Overall its a great a great editor and for large custom projects I highly recommend its use but for lightweight scripts I've found a new solution. The E-Text Editor is a very lightweight editor that opens fast and uses much less memory than a full blown IDE like Zend's. The developer's goal when it was creative was two things. First to show off the developer's new history/changes logging system, which by the way is very impressive and rivals if not surpasses the likes off svn and cvs, but for a more individual objective. Your able to see all your changes in a tree-like interface. The second goal was to emulate and work with one of the more popular editors out there today, the mac only Textmate. E is able to use most of Textmate's bundles which make it an out of the box powerhouse for not only your code of choice, PHP in my case, but it supports about 40 languages by default. A lot of projects maintain there own bundles. One of the top of my head is Mootools, which by the way is the best javascript framework out there IMHO. E by its self has a small footprint but to get the full arsenal of features you need to install cwygwin, which can be installed in a shared environent or can be statically downloaded. E has a automatic Download and install wizard to simplify this.

So if your looking for a lightweight editor, a multi-language editor, a windows version of the ever popular textmate, or just a kickass editor, you should really give E a look.

http://www.e-texteditor.com/