Joomlacode.org is the repository for the Joomla! source code as well as many open source Joomla! extensions. It requires separate registration from the the other joomla.org sites.
Please ensure that the activation email is not in your spam folder. If you still can not find it, then email a JoomlaCode.org team member at http://forum.joomla.org/index.php/topic,149788.0.html and ask him/her to email the activation link to you directly.
The "Project Rejected" email should contain specific information regarding the reason(s) why, and may suggest a remedy.
Most common reasons to date:
JoomlaCode.org has setup a Support project please post your issues there, then they can be managed and tracked by the team. http://joomlacode.org/gf/project/support/tracker/
There is a feedback forum for Joomlacode:
Unfortunately, this is something that we can not do. The only option is to request that we delete your project, so that you can resubmit it for approval.
The project was migrated and still needs to be activated by the admin. As soon as we get a request from the admin, we will assign the project to them. It is the admin's responsibility to make a project public.
Re-register your project using a different "Unix Project Name". (This is a known issue that is being worked on as we speak, apologies for the inconvenience )