You can get the most recent version of Scribus from:
There is also thanks to N@twork, anonymous CVS access is updated daily: Only recommended for those who want to stay on the bleeding edge. Instructions for getting the latest source via cvs:
export CVSROOT=:pserver:anoncvs@scribus.info:/cvs
cvs login
when it asks for a password, press return
cvs -z3 co Scribus
This will then download the sources to you into your current working directory. Then:
cd Scribus make -f Makefile.cvs
From here, continue with the Compiling and Installing instructions.