SeedCode Calendar has very simple task dependencies in the gantt charts (one dependency chain per project). You can see a video of this working in the FM11 calendar here (we now include both FM11 and FM12 versions): http://www.youtube.com/watch?v=p6VGOBODc5c
SeedCode Complete adds task templates so you can add taskes to the gantt chart from a template when creating projects or via script triggers as you work on projects. Not MS Project, clearly, but something to look at.
Hope it helps,
Thanks! This was just what I needed.