In case you missed it, Microsoft resurrected the old XML Notepad last year. The new version, XML Notepad 2007, is a .NET 2.0 application for which source code is available on CodePlex. I find it ...

Windows only: If you're delving into XML programming for the first time, or want to tweak a few software files, Microsoft's XML Notepad 2007 may be the no-nonsense editor you're looking for.