I think that most of the distributions have disabled DVD playback and/or MP3 playback. However, it is very easy to download one of the popular dvd players, and the libdvdcss piece that allows you to play encoded DVD's.
Personally, I like Fedora Core. It has MP3 and DVD disabled by default, but you can get what you need by going to freshrpms.net. The DVD player that I prefer is OGLE, and the MP3 player that I prefer is XMMS.