I wrote a web based XPath tool in ColdFusion today. The tool will allow you to perform an XPath query on a XML document, it then highlights the results and also dumps the XmlElement returned from the XPath query.
I got the idea from RichPallet's XPath plugin for eclipse, but I thought it would be cool to be able to do it from the browser.
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Have you seen XPath visualizer? It does XPath evaluation entirely client side. Windows/IE only. http://www.vbxml.com/xpathvisualizer/