There just happens to be another platform that we sometimes develop for, that's not the iPad, and as such we've just released a beta version of OmniGraffle and OmniGraffle Professional 5.2.2.
This release contains a good many bug fixes dealing with shared layers and Mac OS 10.6 compatibility, along with fixes to a number of crashes when working with Visio files, PDFs, and subgraphs.
We've added a preference to turn off multi-touch gestures on laptops that have that feature, and a last-minute hidden preference to disable the scrollwheel to zoom in and out when Commmand is held down, for those of you using Apple's new Magic Mouse.
Much more information is in the release notes page, and downloads are on the beta page.