Presto: A project to add delta rpm support into yum for Fedora users
http://hosted.fedoraproject.org/projects/presto.  A list of presto-enabled
repositories is available there.

presto-utils: Tools for working on presto repositories

Installation:
=============
1- Untar the package
2- Run 'make install'

To create a presto repository:
1- First run 'createdeltarpms <repo dir> <drpm dir>' where <repo dir> is the
   base directory for your repository and <drpm dir> is the subdirectory you
   want to create the deltarpms into
2- Run 'createprestorepo <repo dir>' where <repo dir> is the base directory for 
   your repository. Run 'createprestorepo -m <repo dir>' instead if you want to
   merge the presto information into the normal repository information.

To remove old deltarpms:
1- First remove old rpms from your repository using the tools available in
   yum-utils
2- Run 'prunedrpms <repo dir>' where <repo dir> is the base directory for your
   repository.