Here is Dr. D'Adamo's site, who wrote the book on the blood types: dadamo.com
I dont think that the site spells out the Blood Type Diet , but it does have some helpful info. There is one section on supplements/herbs that are recommended for different problems specific to different blood types.
Easiest thing to do is order the book. I have used the diet for about 3 years and have gotten very positive results--the diet has been right-on as far as telling me what foods make me feel good and what foods harm my body..