Dr. Kurt Harris just posted a rather good analysis of fat on his blog.
http://www.paleonu.com/panu-weblog/2011 ... -fats.html
As we've been saying all along, fat is not to be feared, it's to be understood. Much of what we have been told is based on incomplete knowledge and bad research and bad politics.
I think this quote sums it up quite clearly.
I believe dealing with the incommensurable dilemma of the lipid hypothesis is far more important than using any kind of evolutionary reasoning or being at all “paleo”. If you can’t make the crux move, with all there is riding on it culturally (all the terrible public health consequences), and all the evidence laid out for you, there is no point in going in more speculative directions, like “what did paleo man eat?”.