Haven't seen anything in a low carb context. But here's a review abstract 
that discusses types of fats and insulin resistance in general. Contrary to 
this review I know I've read stuff at the Atkins Site (scientific evidence) 
that low carb (which often means eating lots of saturated fat) increases  
insulin sensitivity.

http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_u

ids=12079860&dopt=Abstract
Ann N Y Acad Sci 2002 Jun;967:329-35    Related Articles, Links 
  
Type of dietary fat and insulin resistance.

Rivellese AA, De Natale C, Lilli S.

Department of Clinical and Experimental Medicine, Federico II University 
Medical School, Napoli, Italy. [log in to unmask]

Animal studies have already shown the possibility to modulate insulin action 
by changing not only the amount of total fat, but also the type of fat. In 
these studies, saturated fat significantly increased insulin resistance, 
long- and short-chain omega(3) fatty acids significantly improved it, whereas 
the effects of monounsaturated and omega(6) polyunsaturated fatty acids 
ranged somewhere in between the two. A recent multicenter study (the Kanwu 
study) on humans has shown that shifting from a diet rich in saturated fatty 
acids to one rich in monounsaturated fat improved insulin sensitivity in 
healthy people, while a moderate omega(3) supplementation did not affect it; 
this second finding confirms previous results in type 2 diabetic patients 
with hypertriglyceridemia. .....

Namaste, Liz
<A HREF="http://www.csun.edu/~ecm59556/Healthycarb/index.html">
http://www.csun.edu/~ecm59556/Healthycarb/index.html</A>