I had converted the xmlrpc library to Jsolait XMLRPC. This library provide a much more intituive way to make XMLRPC calls and also provide a good way to implement Module and Class. However, the classes and modules wrapper can slow down debugging process as it prevent showing source code line numbers in the error console.
I also create a multisite manager. With multisite enable we can administrate multiple sites concurrently. The login screen has been removed and replaced by a sites manager screen - where you can add or remove sites to be managed.
I'm having some problem with the multisite administration workflow. If you have any idea of how multisite administration should be or what you expect it to be, please give me a comment.
You can test it at the demo but you must enable the option 'signed.applets.codebase_principal_support' in Firefox 'about:config' page to be able to login sites on other domains. This may put your browser at risk, so be sure to turn it off when you finish.

Comments
Updates?
Do you have any updates? Or would it be possible to add the last update date to http://groups.drupal.org/node/935? Anyway, if you have something that needs testing I'm available!