OmniOutliner for iPad. Wow! Why didn't I notice? There's now an OmniOutliner for the iPad! OmniOutliner is my preferred outliner on the Mac, among other things because it can be configured in many ways very similar to the Frontier Outliner (especially splitting a point with a simple Enter is something that surprisingly is not supported directly by many outliners - but essential for me when I want to write texts in the outliner). Unfortunately, only cumbersome iDisk import/export instead of a usable Dropbox sync.