Microsoft (Chris Lovett*) has release a free XML editor called XML Notepad 2006 for opening and editing your Xml, Xsl and Xsd files. Along with its drag and drop capabilities it allows you to configure your fonts and colors and has infinite undo and redo actions to name a few of its features. The integrated XML Diff tool is also a cool little gadget worth checking out as well.
*Chris Lovett is a Program Manager on the XML team at Microsoft
XML Notepad 2006 Download
http://www.microsoft.com/downloads/details.aspx?FamilyID=72D6AA49-787D-4118-BA5F-4F30FE913628&displaylang=en
In a previous post I mentioned that Microsoft’s Chris Lovett who is a Program Manager on the XML team