AddThis Welcome Bar API with rules and match examples.
Google CSE with AdSense Custom Channel by using adchannel attribute
Grab the domain from the document.referrer
A widget showing the headlines from the AddThis trending content API RSS feed. Added a transform function which will allow you to make changes to the url,title or remove it altogether from the list.
No-Library (pure JS), HTML, CSS, JavaScript
Randomly rotate various pinboards from Pinterest in a single widget.