event:Selectors for Prototype

http://encytemedia.com/event-selectors/

Very interesting idea of defining events such as mouseover, mouseout, etc. in javascript using CSS syntax combined with Prototype and Script.aculo.us.

While I am not entirely sold on the use of CSS syntax to define these kinds of behavior, it really makes sense from the perspective of separating the content from the presentation layer. Since most of us already use CSS for managing the appearance of the site and applying effects to elements seems like the same concept, it makes a lot of sense to use the same technique for managing both pieces.