Seller: What assurance do I have that this won't arrive melted?

You don't have any assurance about this. My advice. Don't order in the summer.......

Does anyone know the exact % of the fat content in their butter?

Which of their butters? 80% for the salted butter. Or, 80 grams per 100 grams of butter. It's all laid out on their website for each of the products.

So is this 8 individual 1-oz packages, or 8 packages of 8-oz (64oz total)? My guess is the former.....

This listing is for 8 packages of 8-oz (64oz total).

Is Kerrygold grass fed butter totally organic? Cows can be grass fed, but doesn't mean the entire process is organic. Just to clarify.Thanks!

from Kerrgold faqs page "We believe in the organic ethos and our approach to producing dairy products is similar in many respects to those followed by producers who do carry the organic label. Kerrygold products are not organic, and Kerrygold does not seek to apply that label to our products.Like organic farmers, Irish dairy farmers' practices promote healthy nutrient rich soil; encourage wildlife which naturally controls pests and our farmers place animal welfare at the heart of our farming traditions. Like organic products, Kerrygold products are also free of artificial flavors and sweeteners and we only use natural ingredients in our products.Organic farmers believe in working in harmony with nature and using nature's abundant resources in a sustainable way. At Kerrygold, we share this philosophy. Nutrient rich grass is freely available and abundant in Ireland and in fact, approximately 2/3 of the land in Ireland is used for agriculture purposes and 80% of this land is used to grow grass." for more info go to http://w.kerrygoldusa.com/faq/#qa9