XML Notepad 2007 provides a simple intuitive user interface for browsing and editing XML documents.

Handy features include:

• Tree View synchronized with Node Text View for quick editing of node names and values.
• Incremental search (Ctrl+I) in both tree and text views, so as you type it navigates to matching nodes.
• Cut/copy/paste with full namespace support.
• Drag/drop support for easy manipulation of the tree, even across different instances of XML Notepad and from the file system.
• Infinite undo/redo for all edit operations.
• In place popup multi-line editing of large text node values.
• Configurable fonts and colors via the options dialog.
• Full find/replace dialog with support for regex and XPath.
• Good performance on large XML documents, loading a 3mb document in about one second.
• Instant XML schema validation while you edit with errors and warnings shown in the task list window.
• Intellisense based on expected elements and attributes and enumerated simple type values.
• Support for custom editors for date, dateTime and time datatypes and other types like color.
• Handy nudge tool bar buttons for quick movement of nodes up and down the tree.
• Inplace HTML viewer for processing xml-stylesheet processing instructions.
• Built-in XML Diff tool.

New features included in this version:

• Added keyboard accelerators for find again (F3) and reverse find (SHIFT+F3).
• Added support for loading IXmlBuilder and IXmlEditor implementations from different assemblies using new vs:assembly attribute.
• Made source code localizable by moving all error messages and dialog strings to .resx files.
• Added a default XSL transform.
• New icons, a play on the Vista "Notepad" icons.

Bug Fixes included in this version:

• Fixed install on Windows Vista machines using Windows Installer XML 3.0.
• Performance of expand node when validating.
• Fixed bug where changed schemas and transforms were not being re-loaded.
• Fixed spurious warnings about file being changed on disk.
• Fixed handling of very long text nodes.
• Fixed round trip of DTD content in <!DOCTYPE> tags.
• Fixed validation of elements with xsi:type attributes.
• Scroll bar not updating when node expanded/collapsed in some cases.
• Tree view needs horizontal scrollbar.
• When XML Notepad is minimized and file changes on disk, the file reload prompt is confusing. Notepad should be restored first.
• XSL output window should pick up new xsl-transform based on input document.
• Fixed unhandled exception when closing a group of XML notepad windows.
• Added registration of "Edit" action for .xml file extension.
• Move source code to CodePlex.

http://www.microsoft.com/downloads/details.aspx?FamilyID=72d6aa49-787d-4118-ba5f-4f30fe913628&DisplayLang=en