I had a conversation today with an associate. He mentioned to me that a Google Engineer told him that when using domain variations such as mywidgets.com and mywidgets.net a base href tag on the page would satisfy them and he would not have duplicate content issues as long as he did not promote more than one domain.
This was the first I had heard of this use of base href. I of course promoted the idea of the 301 redirect, but he is still unsure. He had also been to the SEW show a couple of years ago and none of the SEOs he spoke to mentioned using 301 for domain variations.
I was hoping to get some discussion on this use of base href. I will be showing him this thread so he can follow along.