dsc.py (Debian Security Check) is a Python script that automatically notifies a machines administrator when installed packages require a security upgrade.
Read about it here
This week there were 9 Debian security advisories released, and I dont always know which ones apply to my server. This is especially hard in the case of libraries (think fast: do any of your services depend on freetype?). dsc.py will only notify you of packages that actually require upgrades.