Obaid Ahmed has released “ProtoFlow widget” under opensource. ProtoFlow is a coverflow-like component on top of Prototype and Script.aculo.us. The actual “holder” for the images can be anything. You can have a UL with a bunch of LI’s and all those LI’s would be used to create the flow effect. Captions are held in UL (I wanted to use ALT attribute in the images to hold captions but I think this way we can create a ProtoFlow effect out of all sort of HTML elements.