This page has a selection of very useful videos that go a bit deeper into the science of nutrition, diet and attaining your ideal weight.
I just found this video. I highly recommend this video to anyone serious about weight loss.
Get Fit, Lose Weight, and Feel Great the Easy Way! | Dr. John Briffa | Full Length HD
A very interesting presentation on diet from a Microsoft engineer
Here is a great video about motivation
More videos below:
This video is not specific to diet, but it is about will power which is pretty darn important to someone trying to lose weight.