The Beta channel has been updated to 13.0.782.24 for Windows, Mac, Linux, and Chrome Frame. For an overview of the features shipping in Chrome 13, check out the Google Chrome Blog.
The full list of changes (spanning 5000 revisions) is available in the SVN revision log. Interested in switching to the Beta channel? Find out how. If you find a new issue, please let us know by filing a bug.