Debugging XSLT in VS2010

My team has been working on some new functionality that’s really configuration heavy.  One of the challenges we’ve been facing with this project is managing all of the changes to the central configuration file.  In an attempt to add some order to the chaos we decided to start with a base file and apply a series of XSLT sheets to it so we can ensure a consistent state.  I haven’t worked with XSLT in years so aside from relearning the language, one of the first things I did was start looking for a tool that could help me build and test my new sheet.