According to Protopattern, Overlay101 is a ridiculously easy, zero-engineering way to add useful, contextual help to your web page or web application without writing any code.
"We built this because as web developers we're always asked to implement an in app context sensitive help system, but maintaining that help system and keeping it up to date really calls for a crm like functionality," according to Protopattern's Case Nelson. "FAQ pages and knowledge bases are rarely visited and users shouldn't need to context switch to find out if there's an answer posted on some subsite."
Overlay101 is in beta right now. But in the coming weeks they say they will be adding new features, better looks, better performance and many user-interface additions.