I have seen some iPhone demos from Deltek on last year's Insight in Orlando but I have no clue if they are still working on that. And yes, Gerald is totally right, with 6.1 anything else but Windows will not be an option for a while. We use VMWare Fusion on Apple Machines and it works really well, Parallels Desktop should work fine too.
And if we are all very lucky, there will be a .net Framework for apple in the nearer future (http://www.mono-project.com/Main_Page
) but I have no clue if Deltek has any plans supporting this one.