Finally finished the first beta release of the XML Hammer tool. After half a year trying to come up with the best User Interface, have settled for the current incarnation.
The XML Hammer application is a free and open-source tool that simplifies elementary XML actions like checking for well-formedness, validation, transformation and xpath searches using any JAXP implementation.
To download this version please go to:
http://www.xmlhammer.org/downloads.html
Any suggestions are more than welcome.