After knocking around on Windows since last August, the Google Chrome Canary pre-dev build is now available for Macs. In the words of Google, "it automatically updates more frequently than the Dev channel, and does not undergo any manual testing before each release. Because we expect it to be unstable and, at times, unusable, you can run it concurrently with a Dev, Beta, or Stable version of Google Chrome." [Chromium Blog]