Online Tutorials and Reference

Cyber Film School

http://www.cyberfilmschool.com/

DVcreators.net

http://www.dvcreators.net/

2-pop.com

http://www.2-pop.com/

Post Forum

http://www.postforum.com/

The "Unofficial" iMovie FAQ

http://www.danslagle.com/mac/imovie/iMovieFAQ.html