Google has released via its Google Code project an implementation of XSLT in javascript... Quite interesting to improve the development of AJaX based applications, I think this is the only reason to put the term AJaX in the project... But it is true that everytime you put AJaX in a title of something you are getting people interested...
The source code is available in sourceforge.
Feel free to post comments into the Google group created for this