Roland's Debian page contains the latest pre-releases in the stable (2.5) series. Usually release-candidates, in which we have some trust (not necessarily heavily tested, though).
A variation of the last known upstream version, with just a bit of directory renaming. This file is to be used as the sourceforge_2.6.orig.tar.gz on which all 2.6-based Debian packages will be built.
A short guide, on how to build 2.5 or 2.6 package from cvs.