The link Nico provided assumes you are using the linux version of
Chromium... it also seems to be out of date considering my last
experience using it in linux.
If you are using linux (I only know some things about _Ubuntu_
distro), you should be able to set up a third-party repo to find the
updates for Chromium. I'm not positive on this, but if you do a search
for Chromium repo you may be able to find your answer.
If you're using the Windows version, I haven't seen anywhere to auto-
update the browser. It may be updating when I'm not looking like the
extensions, but I don't think so. I'm looking for a way to set up auto-
update for Windows version, currently...
If you just want a general Chrome experience (faster than Firefox),
it's probably easiest to just get Google Chrome (here:
http://www.google.com/chrome
). Plus it tends to be less buggy (although also seems to be the
testing ground for new features before they go to Chrome from what
I've read).