Installing Ubuntu Restricted Extras
http://www.starryhope.com/linux/2010/ubuntu-restricted-extras-lets-ubuntu-play-everything/
This package, in turn, will download, install and configure Flash, Java, core Microsoft fonts (the fonts used on many websites), MP3 support, DVD support (for unencrypted DVDs) and support for just about every other audio and video format you can imagine.
ubuntu
