First of all, Brian has a nice post Is the omega-6:omega-3 ratio of beef relevant? in which he questions some of the assumptions about the fatty acid profiles of different meats.
Stephan has also posted a good piece on a very healthy fat: lard. The L Word - some interesting ideas there, e.g.,
Lard from pasture-raised pigs is the second-richest food source of vitamin D by weight, after cod liver oil.
If you are interested in other high fat science, have a look at Peter's Hyperlipid blog in which he explains his approach:
...... I eat a high fat diet, approximately 80% of calories from animal fat, with enough protein to meet my needs and enough carbohydrate to stay out of ketosis (just). After eating this way since June 2003 I feel better than I did as a teenager. I'm 52. I am always looking for evidence that I may be wrong to eat against most current medical advice.