I have implemented a very simple validation site. You just put an XML and XSD to it and it tells you if your XML document is valid. Simple.

Just vist XML Validation site and try your XML against XSD. Please notice that it is version 0.01 so I presume you know what that means. :)

When and if it will be updated is depended on the planet polarization.


Related:
http://blog.stegnar.com/2009/06/03/SimpleXMLValidationWithNET35.aspx