Follow the steps in this Instructable to set up Ubuntu, and Chromium if you haven't already.
Some potential uses for this type of system:
* Web Kiosk
* Information Booth
* Subsonic Guest Interface
* X10 House Control
Step 1: Add XScreensaver & Ubuntu Restricted Extras
If you will be using flash you will need to install the plugin for it. The best way I've found to do this is similar to adding xscreensaver. In the terminal window enter "sudo apt-get isntall ubuntu-restricted-extras -y". Once this is done close the Terminal window.