This Short Cut demonstrates how to use Prototype for a wide range of tasks, including event handling, DOM processing, string and form process, and Ajax communications. It explores Scriptaculous' visual effects library, from pulsate to squish to fold and beyond. Need interface components? You'll find form autocompletion as well as drag and drop support.
In addition to sample code and explanation, the Short Cut includes member references for both Prototype and Scriptaculous.