Debian includes a package called "vrms - virtual Richard M. Stallman" which report the non-free packages you have installed on your Debian system. Running vrms on my workstations gives the following output:
makholm@makholm:~$ vrms Non-free packages installed on makholm gcc-4.2-doc documentation for the GNU compilers (gcc, gobjc, g++) gcc-doc-base several GNU manual pages sun-java6-bin Sun Java(TM) Runtime Environment (JRE) 6 (architecture sun-java6-jre Sun Java(TM) Runtime Environment (JRE) 6 (architecture sun-java6-plugin The Java(TM) Plug-in, Java SE 6 xsnow Brings Christmas to your desktop 6 non-free packages, 0.4% of 1487 installed packages. makholm@makholm:~$
Sun Java is a know evil and somebody really ought to reimplement xsnow, but having the virtual RMS declare GNU documentation non-free is a nice touch. Yeah, I know about the problems with GFDL.