>Is this project based on old jdonkey?
No, this project has some code from old jmule project, but the system core/design is written from scratch
>How can I help you?
I don't know, you should try to find and fix bugs, advise new ideas, etc. For now our development priorities are focused on kad and network infrastructure.
>Who make the design decisions?
Anybody with sufficient knowledge, someone who can accomplish the projects goals http://jmule.org/?page=goals
, but the final decisions are made by the core developers, if you have something interesting: code/ideas/comments... send them to us : jmule [at] jmule [dot] org
>Can I try to write de comments for javadoc?
Yes, of course