Amazon recently started allowing folks to lend out their ebooks they purchased. No, really, they did! This entirely depends on how the author / publisher set it up with Amazon. If you lend out a book, it is for 14 days. You can’t read it until the 14 days expires. Imagine that! No more worrying if you get your book back!
You can read the Amazon book lending FAQ here.
Someone created a Kindle book loaning club. Wow! That didn’t take long! Join up here.