Hi kstran,
Dunlop and Talalay are just different methods of manufacturing latex foam and they are not better or worse as much as they are different from each other … each production method with it’s own advantages and disadvantages.
This article along with post #2 here and post #2 here should provide you with all the information you may want about the different types of latex (and possibly more than you want :)).
Post #6 here talks about some of the different latex testing certifications.
You can see my thoughts on the Ikea latex mattresses in post #3 here.
Hope this helps
Phoenix