Cool! I wanted to say that the Gantt chart component in the WinForms app is GTP.NET from plexityhide.com, and in the Silverlight version it is GTP.NET.SL from plexityhide.com; watch demo here.

 

I also wanted to comment that the use of a framework like ideablade is really key to getting things done fast and still have them maintainable; but I always recommend the ECO framework from CapableObjects.com for cases like this.