Wonderful Bastien. 

Part-1
======

Did you forget to upload http://orgmode.org/pkg/daily/archive-contents?
Once this is done orgmode.org could be used as an ELPA repo in and of
itself. I am attaching a sample archive-contents for your ready
reference.

Part-2
======

Downloaded and installed org-20101020.tar. The installation process
reported some compile time warnings. See down below. 

Part-3
======

There is an interactive defun package-upload-file in package-x.el that
can automate the creation of a new entry in archive-contents.

Rough instructions are

1. Hand fix package-upload-buffer-internal
   - point archive-url to our own repo.
   - comment out the call to package--update-news

2. (setq package-archive-upload-base "~/pkg/daily/")
3. (package-upload-file "/tmp/org-20101016.tar")
   
Step-3 will 
1. Download existing archive-contents
1. copy /tmp/org-20101016.tar to ~/pkg/daily/
3. Update archive-contents with the new entry.

If this is all too hairy may be one can just write a emacs batch script
that adds/removes entries from archive-contents taking care to use
(version-to-list ...) for recording the package version.

Jambunathan K.  

Attachments:

1. archive-contents