I have both the .com and the .org for a domain name, and using Apache I point them to the same site content. I think this might be causing problems with the Search Engines because of duplicate content. I want the .org to be the essential website. How do others handle this situation? Should I be using 301 redirects to point all the .com requests to the .org? Should I just use the link rel="canonical" on each page to point to the .org?