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Occasionally I'm working on something that has to scrape data, either from an HTML file, XML, or something similar. I'll often think of XPath for its sheer simplicity over REGEX. Thankfully, while looking for a solution on how to "screen scrape" Outlook Web Access to verify login credentials (mimic internal authentication to AD externally), I accidentally came across a blog post discussing this Firefox plugin by Brian Slesinsky. It allows you to simply right click on a DOM node in a page (or source file) and visually test your XPath queries to see the matches it will give back.

Firefox Plugin: XPath Checker