WordPress.org

1. Download the files wpds.pl and wpds.ini
2. Change the parameters in wpds.ini such as your WP database settings
3. Copy it to your scripts directory (ask your webhost)
4. Make sure you have all the required Perl libraries installed, particularly the The Net::Delicious library (by Aaron Straup Cope) (depending on your host it could be that some Perl modules are available and others not so it is hard to give a generic description on what modules are needed, if you are lucky it will work directly because all modules are already available, (if you have questions just use the comment section below) (if some modules are not present you will get an error that a library is missing, it is simple to install missing libraries) (if you are still unsure about what Perl modules / libraries are: there are millions of threads to be found on this basic concept) (don’t be afraid to learn something new)
5. Schedule your script via a crontab, either by the shell or via your control panel e.g. 15:50 for Dreamhost or Mediatemple. Make sure it runs once a day around midnight. (With most hosting companies you have somewhere in your control panel an icon that lets you schedule scripts, look for it!)

See http://wp.leau.co/?p=7 for much more description