David Wolf has made his MA Exegesis—Vidgets: The Development and Use of Interactive, Network Based Video Works—available online and it's worth a read. The paper deals with these questions:
David has been working with interactive works using QuickTime for years using both LiveStage Pro and Quartz Composer. This is an excellent overview, be sure not to miss the appendix containing a complete list of his works.
This is the personal website of Andreas Haugstrup Pedersen: commentary on media, communication, culture and technology. Read more»