[psidnell]

CarbonFin outliner (iPhone/iPad versions available) is promising opml support via dropbox in the future, so that will provide some way of getting you outlines onto the phone. At the moment you can only import/export opml via their web site.

But it's probably best to regard CF Outliner as a read only viewer for OO outlines since if you edit the outline and export it back to OO you'll lose all the fancy OO features. For vanilla text outlines it seems fine in the experiments I've run so far.