One website which I think is excellent is: But you don't look sick. The founder, Christine Miserandino, who suffers from lupus, created the site to give an outlet to those with invisible illnesses. The site is full of articles, essays, reviews, forums, and much more. For many, it has provided helpful information and support in feeling less alone.
A favorite on the site is Christine's Spoon Theory. If you haven't read it, it is well worth the read. I think it is applicable to many illnesses, including eating disorders. It reminds of spoons lost in my life and how I want to use the spoons I have left.
Christine is also going to be featured on blog talk radio today at 12 PM EST to kick off the week.