If you track testing or unstable you can remove
references to stable from /etc/apt/sources.list and
/etc/apt/preferences because testing starts as a copy
of stable.
The difference between upgrade and dist-upgrade only
appears when new versions of packages stand in different dependency
relationships from old versions of those packages. See apt-get(8)
for details.
aptitude upgrade and aptitude dist-upgrade start
aptitude in the commandline mode. You can switch these to full
screen mode by pressing e key.
Some *config scripts are disappearing in the newer Sarge release
and the package configuration functionality is moved to the
debconf system.
Debian Quick Reference
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