A quick note that the IntelliGantt Add In for MS Project 2010 Standard or Professional now supports Office 365 and SharePoint.com. This means you can share projects to internal SharePoint sites using your regular windows credentials, to external SharePoint sites using Forms Based Authentication or to sharepoint.com sites using Claims Based Authentication. The nice thing about all these options? You don't have to worry about selecting the right one, our IntelliGantt Add In figures it out for you.
Our IntelliGantt Web Part has of course been working with SharePoint online for a while. Now that the IntelliGantt Add In communicates with SharePoint online as well, the best way to sync and interact with tasks is ready. You have full mapping features available so that you can choose whether a field is updated bidirectionally, or is only owned by MS Project. This means no one will ever overwrite your start and due dates in MS Project again.
Here is the 'proof' screenshot:
But really, there's no better way than to check it out.