EasyEnvelopes represents a full application in the form of a Dashboard Widget

"EasyEnvelopes is a MacOS X Tiger (10.4) widget for Dashboard, so it is instantly available no matter what application you are using... EasyEnvelopes allows you to create picture-perfect envelopes every time... Since EasyEnvelopes integrates with your Address Book, you can quickly and easily address an envelope to a friend or business contact..."

Lots of widgets are recasts of small utilities or simple windows into a larger external application or website. This is a stand alone app. As more little apps like this emerge Dashboard will become a functional environment.