Here's a link to a very useful tool that'll download the latest Google Chrome (well Chromium) nightly build. I decided to use this due to the vertical scrolling issue with Google Chrome that was driving me mad. The bug was present in the release of Google Chrome but fixed in the nightly builds.
I've been looking into getting SilverLight to work with Google Chrome or Chromium and came across a post about something called Chrome Channel Switcher which looks like it automatically updates your Chrome install to either Beta or Development builds. Could be useful! There are links directly to the executable download from Jon Galloway's blog post.