Amish Proverbs: Words of Wisdom from the Simple Life by Suzanne Woods Fisher looks cute and is free today.
B&N Amazon
I haven't been posting many lately, but the Baker Publishing Group generally has a ton of free books, mostly historical romance and Christian self-help.
Here's a list of the books at Barnes & Noble ordered by price (so the top ones are free).
Baker Publishing Group, by price
If you happen to like Amazon, they're split among the individual publishers. Here are links to free books from the two largest publishers in the group.
Revell
Bethany House