Last week, Widgetbox launched the ability to simply (a couple clicks) turn your widgets into Facebook Applications. They run on the profile page, have their own 'canvas page', are sharable, and hit the Facebook newsfeed.... making the widgets viral and accessibleacross your Facebook network. A couple examples / screenshots:

My Blidget Pro

Converting it into a Facebook App

It is a step-by-step flow that allows users to customize the look of version that appears directly on the Facebook Profile:

Facebook Customize App

Facebook App: On The Profile (different example)

There are two versions of the Facebook App: one for the profile page (think of it like a mini-app) and the full version on the canvas page:

Facebook App Profile

Facebook App: Full Canvas Page

Facebook App Canvas Page