[offline]

Agreed - there are timeline tools for the Mac and OmniPlan (amongst others) deals with Project Management.

But - I need to create a timelines vis-à-vis the current Visio implementation on regular basis for conceptual illustration.

My druther would be to work in a single graphics program (I can do it all in Visio) on the Mac platform, and OmniGraffle Pro is the strongest contender so far. With a little bit of work, well -- it would be nice.

I realize you'll work on new features that appeal to the broadest market first, this is a business reality. But if you've got a creative programmer with a little time on his hands - you might find having the ability to deliver this functionality opens other doors and additional markets.