http://www.activestate.com/komodo-edit

I Love this editor, great for scripting languages. Makes Ruby bearable for me, and makes Perl more fun. Tcl -- eh still don't like it.

This Editor has Intellisense and all those other great things.

Multi-language file support

Correct syntax coloring of multi-language files and templated files, common in many web programming frameworks. Add custom language support (User-Defined Languages or UDL, used to provide support for RHTML, Template-Toolkit, HTML-Mason, Smarty and Django).
Standard editing features

Code commenting, auto-indent and outdent, block selection, incremental search, reflow paragraph, join lines, enter next character as raw literal, repeat next keystroke and clean line endings on "save".
Syntax checking

Instant feedback for all fully-supported languages
Syntax coloring

Spot errors easily and improve readability and context, even in multi-language files (unique to Komodo!).
Vi emulation

Modal Vi keybindings emulate navigation, text insertion and command behavior. Custom commands can be implemented by adding Komodo macros to a Vi Commands Toolbox folder.
Emacs keybindings

Emacs-like keybinding scheme supports new editor features modeled on Emacs, such as transient marks (similar to the Emacs "mark ring"), repeat next command and reflow paragraph.
HTML preview

Check HTML, XML and CSS files side-by-side or in a browser, using arbitrary files or URLs.
Multilingual Input Method Editor (IME) support

Use your standard keyboard to enter multi-byte characters, such as Simplified Chinese, Japanese and Korean.
Code snippets

Store any piece of code for reuse.
Code folding

Work quickly and efficiently with large sections of code.
Multi-document editing

Easily work on multiple documents simultaneously using multiple tab groups, split view, and cross-document search.
Tutorials

Easily master editing features.
Project manager

Convenient, flexible organization of all project elements.
Live Folders

Project view displays the current contents of corresponding file system directory.
Virtual Folders

Explicitly maintained multi-purpose containers for any project or Toolbox component, containing pointers to selected components from different file system locations.
Toolbox:

Store it: Store virtually anything, including configurable "Run" commands, macros, code snippets, URLs, Live and Virtual Folders, templates, menus, toolbars and remote files.

Share it: Share a Toolbox with networked team members or distribute valuable Toolbox items to other Komodo users with the import/export function.
XPI Extensions

Create your own plug-ins. XPI extension support provides the same capability as Firefox, with all standard Mozilla APIs based on XUL, XBL, and XPCOM, plus our own for Python and JavaScript. We're even using this in Komodo development; for example, when adding UDL-based languages and defining custom language syntax-coloring. Other new features, such as the DOM Viewer, are also extensions. With full documentation and an active Komodo community providing support, Komodo IDE's power is as boundless as your imagination.

It is a pretty nice editor, and use it from time to time.

I'm starting to prefer it for all my scripting languages..I used to use Eclipse with plugins. Or something like Geany or Gedit. But this is so much better.