I would be interested too to see a comparison with jsuri.
I was about to say that jsuri is not maintained anymore but looking closer on http://code.google.com/p/jsuri/ I saw that now the project is active on github: https://github.com/derek-watson/jsUri with the latest version being 1.2.2
There's also an attempt I made, https://github.com/theozaurus/jsurlify which tries to keep the usage as terse as possible. It would be great to see what strengths / weaknesses all these different libraries have and try to join efforts where sensible.