Scribus is being updated on a regular basis. If you always want to use the latest and greatest stable Scribus version, here are the download resources:
Pre-compiled binaries for Mac OS X, OS/2 Warp4/eComStation and Windows are available from our Sourceforge repository.
RPM packages for most RPM-based Linux distributions are available mrdocs' RPM repository. Simply add the repository for your distribution to your package manager (YaST, yum etc.) to update Scribus automatically.
For DEB-based distributions (Debian, *buntu), please read the installation instructions.
Along with the binaries for Mac OS X, OS/2 Warp4/eComStation and Windows, the Scribus Team also makes the Scribus source code of every release available via Sourceforge.
If you want to enjoy the latest bugfixes and feature enhancements that have been added to the source code, but haven't been released yet, you need to check out SVN.