Sisyphus is quite dynamic project which makes it hard to schedule and perform releases based on it. To overcome this system of branches was invented: Sisyphus is regularely branched creating a new repository which is then stabilized for several months. Resulting repository is called a branch and can be used as a basis for distributions and solutions.
Every branch is an APT repository containing source and binary RPM packages along with metadata.
p9 is the current stable branch, see downloads; p8 is oldstable; previous branches are available in the archive too.