This thread is basically going to give a review on all the IDE's/Editors used by people here at Zymic. Please keep this a nice clean factual debate with a small review of the product.
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Name: WeBuilder 2010
Publisher: Blumentals Software
Cost: Starts at $50
Features:
* Edit HTML, CSS, JavaScript, PHP, ASP, Ruby within single program
* Clean, lightweight and extremely fast loading
* Familiar interface allows to jumpstart
* All essential code editing features are right at their place
* Fully customizable text editor, menus, toolbars, shortcut keys
* Efficiently reuse common code fragments
* Few click FTP upload or update
* Easy to learn and use
* Various templates and code snippets
* Quick start HTML and CSS wizards
* Helps to learn HTML, CSS and even some scripts
* Speed - loads very quickly
* Sophisticated, fully customizable and familiar text editor
* Syntax highlighting for HTML, CSS, JavaScript, VBScript, PHP, ASP, WML, XML
* Syntax highlighting for ASP.Net, C#.Net, Ruby, eRuby, Perl, SQL
* UTF-8 and UTF-16 Unicode Support
* Advanced HTML editing with Auto Complete, Inspector and other tools
* Advanced CSS editing with built-in CSS editor More info
* Advanced JavaScript editing with built-in JavaScript editor More info
* Advanced PHP editing with built-in PHP editor More info
* Advanced Ruby editing with built-in Ruby editor
* Debug PHP code with xDebug debugger More info
* Realtime PHP Syntax Check
* Code snippet library and code templates More info
* Save and open files directly from FTP/SFTP More info
* Project management and FTP/SFTP publishing
* Matching bracket highlighting
* Matching and HTML tag highlighting
* SQL database connectivity (MySQL, PostgreSQL, Firebird, Interbase) More info
* Search and Replace with Regular Expression Support
* Search and Replace in files
* Spell Checker for text in HTML code and TXT files
* Code collapse
* Multi Item Clipboard
* Ready to use Code Templates
* SVN Support via TortoiseSVN and shell menus from File Explorer
* Countless goodies (block select, line highlighting, text indentation etc.)

Why it benefits me: I am employed as a Web Developer/IT Developer using HTML, CSS, ASP.NET, MySQL, PHP and random files on a daily basis and it is very important I have syntax highlighting, references and snippets on demand. One other good thing is you can manage projects from this nifty IDE. So, for every site you have you can have a "project" which includes snippets, templates, FTP info, etc. all within the same IDE.
Known issues: Not MacOS version yet.

Name: <oXygen/> XML Editor 10.3
Publisher: SyncRO Sof Ltd.
Cost: Starts at $64 (academic version), $349 (professional version) or $449 (enterprise version)
Website: http://www.oxygenxml.com
Features:
* WYSIWYG XML Editor (Visual XML editor) --- I barely use it since most of my work is with XML
The Author mode of the <oXygen/> XML Editor demonstrates a new productive way of editing XML documents, similar to a word processor.
* Intelligent XML Editing
The context sensitive content assistant is changing the way you edit documents, helping you create valid content all the time.
* Extensible XML Editor
Starting with version 9 <oXygen/> adds a new concept called Document Type that solves the problem of providing ready to use support for a framework or an XML language. The Document Type concept is used to provide the built in support <oXygen/> has for a number of XML frameworks (DITA, DocBook, TEI) but, more importantly, it can be employed to provide support for a user defined framework that needs to be shared with other users.
* XML Grid Editor
The <oXygen/>'s grid editor allows you to edit repetitive XML content in a special layout similar to a spreadsheet application, without the need to interact with markup.
* XML Outliner
<oXygen/> XML Editor comes along with a powerful outliner which is automatically synchronized with the document changes.
* XInclude Support
<oXygen/> XML Editor supports XInclude which is a standard for building up XML documents from smaller pieces, being a replacement for the external entities.
* XML Validation and Well-Formedness Check
The XML validation can be done by checking the documents against a schema. <oXygen/> XML Editor supports: XML Schema, DTD, Schematron and Relax NG schemas.
* XML Formating and Indentation.
An useful utility is the XML document formatter.
* Unicode and Internationalization
<oXygen/> XML Editor supports a large number of text encodings. Unicode is fully supported.
* XML Diff & Merge
A complete diff and merge solution is available in <oXygen/> XML Editor. It offers both directory and file comparison, six different diff algorithms and multiple levels of comparison.
* XPath support
XPath is a language for addressing specific parts of an XML document. XPath, like the Document Object Model (DOM), models an XML document as a tree of nodes. An XPath expression is a mechanism for navigating through and selecting nodes from the XML document. You can executes XPath queries on opened documents. Both XPath versions 1.0 and 2.0 are supported.
* XML Digital Signature and XML Canonicalization
The digital signature is a requirement when exchanging information in an untrusted network. Since XML is used for content storage it is important to be able to sign the XML files or messages.
* <oXygen/> Tree Editor
XML documents can be viewed/edited in a graphical tree. The tree editor is handy for large size documents.
* Helper Views
There is a set of panels located at the side of the editing area helping the XML editing. They present the model of the edited XML element, the available attributes and entities.

Why it benefits me: Currently employed with a software company doing both design and software work. So when it comes to coding in XML, XSLT, xSchema, HTML, XHTML, CSS, JAVASCRIPT, PHP or any other languages, it is very useful. It is also good for personal use.
Known issues: Remote file editing feature is not fully complete. The tree does not updated based on the latest document.

Another thing that is handy to look at when choosing an IDE, is how well it performs with minimal memory, etc. The more silently it can work in your system, the better off you are.