I was tired of reading and answering all the p4a related questions on the Plone user mailing list and wrote a book about it ;-).
The book is now available:
In the book you will find help on how to set up a customized multimedia CMS by collaborating with external resources such as YouTube, Google videos as well as to use and extend specialized multimedia content-types for images, audio, video, and Flash.
Plone 3 Multimedia provides a rich repository of tools and techniques to add full multimedia power to Plone along with collaboration with many external web resources in order to build an interactive Plone site. The readers will learn to structure their content by tagging, rating, and geolocating through this practical guide. Furthermore, it also gives readers an insight into how to upload, store, and serve their multimedia content in an effective way.
Using this book, developers will be able to include photos, movies, audio, and Flash-applications into their Plone site to make it more user-friendly. In addition to learning about the various video and audio formats best suited for web publishing, developers will also be able to get to grips with categorization, syndication, upload, storage, and serving of multimedia content. This book will also enable developers to create an engaging user experience by including powerful Silverlight web and mobile applications into Plone.
A step-by-step tutorial packed with hands-on-examples, this book is ideal for Plone integrators who want to extend the core of Plone with multimedia features and want to learn to use multimedia effectively. The book is out now and available from Packt. To read more about it, please visit: http://www.packtpub.com/plone-3-3-multimedia-website/book
There is a full example including a buildout on how to set up a secure video on demand solution using Plone and the Red5 Flash Server.