Todd Ditchendorf has released AquaPath 1.1, 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." 1.1 allows you to specify the context node for the XPath expression, shows line numbers in the source editor, and is now a Universal Binary. Mac OS X 10.4 is required.
