The number one requested feature for The Plan Is so far is the ability to display schedules as Gantt charts.
A preview of this feature is now being slowly turned on for users - including the ability to set dates by drag and drop and a few other nice things.
This is still an early version, and for the moment only supports Firefox and IE8. Support for other browsers should follow along soon along with a lot of upgrades to its capabilities. Edit: Now updated to support IE7, Safari and Chrome!
At the same time it has been possible to track down and squash a couple more bugs in the automatic scheduling logic. If you do see anything that looks wrong, no matter how small, please let me know and I'll sort it as soon as possible.