When I was living in rural England and suffering from bulimia , the Internet was a lifeline of support and information.
One site that I found particularly helpful was Something Fishy
Other useful links are:
Elisabeth, from Germany, is starting a new social networking self-help site for people trying to overcome bulimia (no pro-people please!).
Here's a list of books that I found really helpful in terms of understanding the causes of eating disorders and learning to overcoming them:
The Body Project - An Intimate History of American Girls by Joan Jacobs Brumberg. I found this book particularly fascinating because it traces the changes in emphasis from developing a girl's character to her looks over the last century. I would read this book in a mother-daughter book club with my daughter at some point. There's so much for discussion.
The Body Betrayed - A Deeper Understanding of Women, Eating Disorders, and Treatment by Kathryn J. Zerbe, MD
The Disappearing Girl - Learning the Language of Teenage Depression by Dr Lisa Machoian
The Secret Language of Eating Disorders - by Peggy Claude-Pierre
Most of the web sites listed above have resources for finding treatment. I received treatment at The Wilkins Center for Eating Disorders, an outpatient facility in Greenwich, CT, run by the truly inspirational Dr. Diane Mickley.
Young, Male, Straight - and Anorexic - Great piece by Snowden White about his experiences dealing with anorexia. This isn't just a "girl disease".