Application source code
-Accessed on the web (in a separate static branch of your code repository)

Latest (updated) specification and design documents
-Keep those short! Consider what is/isn’t important for customers/devs.
-Highlight major changes from the LCA versions of the documents.

Updated test plan, including actual test cases
-Automated tests (if applicable)
-Usability testing plan
-What questions you plan to ask your beta users? What areas to focus on?

Up-to-date schedule
-Including what has been accomplished and what remains to be done still

Release notes
-Known issues with prioritization, shown in the actual bug tracking system
-Detailed instructions on how to run your application from the sources or else zipped with correct directory structure