Well, we finished up the remaining compatibility issues with Mac OS X 10.5, most importantly the bug where exporting to PDF could lead to creating a folder that the Finder thought was a Graffle file, and possibly overwriting the originating document.
Other notable fixes include the return of folder import and those folks using Subversion should have an easier time with Graffle documents saved out as file packages.
Full release notes and the beta download can be found at the OmniGraffle beta page.
