Hi there,
Thanks for your interest into this project.
May I know your server-side platform? FYI, there are two developers implement server-side of the jquery form builder in PHP and django. If you are targeting these two platforms too, I think you may want to work together with them.
To find out more about how to implement the server side, please look into architecture document of the Grails server-side implementation at
http://code.google.com/p/grails-form-builder-plugin/wiki/Architecture.
Hope this help.
Best regards,
Chee Kin