Revised review: Ommi requires use of their proprietary sync mechanism. It is buggy. Ive gotten very tired of sorting through different versions of the same outline, trying to figure out the differences. Why not Dropbox? Tip: to use omnioutliner as a regular outlining app, create an OPML document on your desktop, use omnisync to sync it with the app, and then duplicate it whenever you want to make a new outline. You wont have access to any of the fancy formatting options--they wont be preserved in OPML--but you will be able to use this apps fine interface while keeping your data out of Omnis proprietary format.