Apt Repository to install: Skype, Acrobat Reader, Real Player, Google Earth, restricted video codecs or the Acrobat Firefox plugin for Linux?
...if you're looking for anything above, you should add the Medibuntu Ubuntu package repository to your apt-get/aptitude list! This allows you to install pre-configured and actually working Skype, Acrobat Reader, Real Player, Google Earth packages as well as many video codecs to play DVDs and odd video files under Linux. Furthermore you can install the Acrobat Reader plugin for Firefox that allows you to view PDFs within Firefox without opening any additional PDF viewer software. Some speech codecs are included as well and restricted video codecs (ppc-codecs, w32codecs, w64codecs) make it possible to play encrypted DVDs.