Lots of sites, and most of them are confusing. :) Below is a link to a great chart that shows which foods are which, but really, what really makes a food acid or alkaline as far as the body is concerned is how you eat them. Foods become toxic if they are not digested properly. So as long as you are following the guidelines for digestive power, eating most tropical fruits and melons alone, most of your foods will have the proper balance for your body.

http://www.reynoldsoffice.com/ph.htm