Samuel Asher Rivello gives a presentation on AS3-Signals, an open-source library that provides an alternative to Flash events for messaging between objects. It allows objects to communicate without requiring inheritance, uses typed signals to pass custom data, and works well with the Robotlegs framework. The presentation demonstrates AS3-Signals syntax, types of signals, and how to add the library to a project. It concludes by taking questions and providing references for further information.