Just one entry for today.
I was looking around for a free XPath expression tester online. Surprisingly, it took me at least 20 minutes to find a free one. Altova XMLSpy Home Edition, while free, does not include an XPath evaluator (it's an add-on in the professional edition).
However, I did find Dimitre Novatchev's excellent (though ugly as hell) XPath Visualizer.
Great tool (although the UI is ugly)! And you just can't argue with free 🙂