% darcs tag --checkpoint -m release-0.6.1
 -- tag release-0.6.1, and allow for --partial get.

% darcs dist -d twill-0.6.1

where to change version number:

   setup.py, version & download URL;
   figleaf/__init__.py
   doc/index.txt, version, download URL, and date;

for release:

    * tag;
    * generate .tar.gz
    * update pypi (setup.py register);
    * announce on clp, tip
