The Beta channel has been updated to 4.0.249.49 for Mac. This release includes a relatively minor update that corrects a potential issue with our auto-update processes for Mac users.
More details about additional changes are available in the svn log of all revisions.
You can find out about getting on the Dev channel here: Early Access Release Channels (Chromium Developer Documentation).
If you find new issues, please let us know by filing a bug at Project hosting on Google Code.
Anthony Laforge
Google Chrome Program Manager
Download: Google Chrome 4.0.249.49