[Enkerli]

Glad CarbonFin is moving to Dropbox, along with many other apps.
I agree that it's more of a read-only system.Its synchronization isn't item by item.
TaskPaper has a few issues but it does synchronization really well (native Mac app, native iPhone and iPod touch app, native iPad app, Web service). Switched to it from OO, for most of my outlining and note-taking needs, and haven't regretted it.