I track unstable but still want to upgrade my experimental packages. The
following /etc/apt/preferences file does exactly that:
Package: *
Pin: release a=experimental
Pin-Priority: 499
Installed experimental packages like xfree-4.3 will be upgraded from the
highest version number, be it from experimental or other sources.list
entries, while keeping uninstalled experimental packages at bay.
--
"You're cute when you're stupid"