[whpalmer4]

Call up the support ninjas and they'll walk you through the process of recovering your work. 1-800-315-OMNI or +1-206-523-4152.

For future reference, if you accidentally delete some project or a bunch of actions and don't realize it until you've synced your change to all of the devices, just go to the Mac, launch OmniFocus, then switch to the Finder and double-click on one of the recent OmniFocus backup files that should still have the project. This will open up the backup file in a separate window, and you can just drag and drop the missing material back into your production database. Close the backup database window after doing so, just to make sure you don't get confused about which window is the active database and check off some tasks in the backup. When you sync, the restored material should propagate to your other device(s) much as if you'd typed it all in again.