Take a look at this tool presented by Einar Lielmanis which is very handy for formatting the silverlight.js files into a readable manor.
This little beautifier will reformat and reindent bookmarklets, ugly javascript, unpack scripts packed by the popular Dean Edward's packer, as well as deobfuscate scripts processed by javascriptobfuscator.com.
The source code for the latest version is always available on github, and you can download the beautifier for local use (zip, tar.gz) as well.