Add notes on using aptitude.

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+Use aptitude instead of apt-get.
+And make sure only directly chosen packages are marked as such (type "M"
+at libraries and such)
+
+Then this gives a list of directly chosen packages:
+
+  $ aptitude search '~i!~M' | sed 's/^... \([\.a-z0-9-]\+\) .*$/\1/'
+
+
+
+If needed besides official packages, use only carefully versioned
+unofficial/backported packages:
+
+Official Debian version strings are either x.y.z-a.b.c or (in case of
+Debian-native packages) a.b.c. Make sure for all unofficial packages
+(wether derived from official ones or not) to include a local tag in the
+Debian-part of the version string - as in x.y.z-a.b.yourtag.d and
+a.b.yourtag.d (where d is your local revision).
+
+Set your local revision as close as possible to the official package.
+  * Simple backport of x.y.z-1.0 is done as x.y.z-0.99.yourtag.1.
+  * Tweaked variant of x.y.z-1.0 is done as x.y.z-1.0.yourtag.1.
+  * New package is done as x.y.z-0.0.yourtag.1.
+
+Then this gives a list of unofficial packages currently installed:
+
+  $ aptitude search '~i!~Vyourtag' | sed 's/^... \([\.a-z0-9-]\+\) .*$/\1/'