I have written a little guide on installing Chromium on a single-user system and keeping it automatically up to date. I have tested it to the best of my abilities, but still need some feedback before I make it available on the 'Tutorials' section of Slackwiki.
Hope it will be of help to some.
http://slackwiki.org/Chromium_browser
Cheers.
EDIT: Just added a use-case section for making the purpose of the guide more clear.