I've made an example package that follows all the standards mentioned above. Give it a try and let me know what you think.
http://projects.mobileread.com/iliad...al/xournal.zip
The program (xournal) itself has refresh issues that I don't think I'll be able to resolve, but it's simple and small enough to make a nice test package.
I can post a tutoral and the files I used for the ipkg later...