OmniOutliner 3.8 beta 2 is now available with a couple new additions! The Keynote importing support has been updated to work with all existing versions of Keynote. What is actually imported has not changed much at all but you no longer need to save to another format to import it if you were before. The HTML exporters has also been updated to support the indent children value so if you like to make your file flat even though it makes use of different row levels, you can now export and have it look the same way.
As always if you encounter any problems, please contact our Support Ninjas by using the Send Feedback option under the app's Help menu or send an email to email@example.com. Full release notes are available here. Go download it now!