[GeekLady]

OF is for personal task management in general, not strictly for GTD. As such should be just as useful for those at the bottom of the heap as for those at the top. And when you're at the bottom of the heap, delegating just isn't important. You can't even rely on those above you to be kind enough to all use OF (or even Macs) when delegating stuff to you.

There's no need for some sort of advanced OF to OF communication/delegation system. Basic delegation within OF could be simply implemented with the ability to create a new email from a task and to create a new task from an email. This would be much more flexible - have other uses than delegation, as well as be usable for everyone not just those who have coworkers also using OF.

And what I just described can be done just using QS (for creating emails) and QE (for adding tasks).

Anything more advanced sounds like a description of how OmniFocus should integrate with OmniPlan.