Todd Ditchendorf has released AquaPath 1.0.2, a free-beer Mac application that can "evaluate XPath 1.0 expressions against any XML document and view the result sequence in a dynamic, intuitive tree representation. AquaPath is based on Apple's Cocoa/Objective-C NSXML and WebKit Frameworks." This is a bug fix release. Mac OS X 10.4 is required.