Apple 'opens up' according to Red Herring with it's new iTunes widget that lets "users list their recent purchases, display their music reviews, or show their favorite artists."
There are a couple interesting things about this announcement. First, the functionality of this widget already existed but Apple still took the opportunity to create their own widget as a branding opportunity. The point is that if your company/brand should be associated with the delivery of a certain type of content then own up to it, create a widget and get your brand out there.
Second, I think the functionality of this widget can be altered to meet the needs of just about any business. Granted few things are as cool as sharing your music favs but the great thing about social networks is there's a network out there for everyone. A network engineer for example may want to use a widget to promote their participation in forum discussions, display their product reviews and show off their personal authority levels. With a little bit of widget magic this can be done and posted on blogs everywhere.
There's a widget out there for every business. What's yours?