no-www considered harmful - defunct
http://www.less-broken.com/blog/2012/05/no-www-considered-harmful.html
I remember reading about the no-www movement years ago. At that time it struck me as a cool thing to do, but I now know that no-www is a really bad idea in general. That’s because the DNS system lets you assign CNAME records to subdomains, including the www subdomain, but only A or AAAA records to root domains. In other words, you can say that www.example.com is the same as test.example.org, but you can only say that example.com is the same as a particular IP address.