I have been using OmniOutliner for planning and multilevel todo-lists for years.

Now I have found OmniFoucus, which syncs great with my iPhone. OmniFocus is also great, but I do miss sublevels in my todo-lists. I have tried to overcome that by dividing bigger projects into smaller projects, but then I feel I loose my Big Picture overwiev (as I have in Outliner).

Any tips or any future integration of "outliner concept" in OmniFocus?