Steve Endow looks at eConnect Integrations: 90% Data, 10% eConnect. I have to say that I generally agree. Even though I tend to work with econnect via SmartConnect rather than as a development environment, the same ratio applies.
Dynamics GP Land: eConnect Integrations: 90% Data, 10% eConnect
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.