While the list of people who have both a Kindle and an Amazon Prime account may be small, if you’re on that list (like me!) I think you’ll be pretty happy with the new perk.
Some treasures I discovered while scoping out the goodness:
Mini Farming: Self-Suffiency on 1/4 Acre by Brett Markham
The Everything Root Cellaring Book by Catherine Abbot (great for me as I was just wondering how in the world to store my newly-dug potatoes!)
You can only borrow one book per month, so choose your reads wisely. Go here for more info on how to borrow.