I have just today found out there are sites to lend kindle books. Amazon started allowing one time lending for two weeks books a while back and I supposed I should have expected various lending websites and groups to pop up.
A quick Google turned up two websites. Probably, if I searched for a longer time, I would find more.
1) http://lendle.me/: They limit you to two requests at a time. Pretty sure you need to post some books to lend first, too. Sadly, most of mine are not lendable. 😦
2) http://www.booklending.com: This website does not appear to have a request limit.
3) Bookreads is a social networking site for readers and there is a kindle book lending group. It’s less organized than the websites, but it should be good, too. People post whatever books they have to lend, post requests for books they want and maybe have them granted. It’s more manual than the websites, but probably works.
On lendle, I requested an issue of Apex magazine and got it pretty damn fast. Far faster than I was expecting. It’s not a magazine I’ve read before and I am looking forward to it.
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- Borrow and lend Kindle books online with Lendle (onsoftware.en.softonic.com)
Story Treasury 
Interesting. I know, before the library changed platforms, I used to be able to check out ebooks and they would just not work once the due date was reached.
Just fyi, for free ebooks for multiple platforms, manybooks.net is completely awesome. New, old, public domain and creative commons books.
My library still works like that.
I know! manybooks.net, archive.org, gutenberg.org, various university public ebook offerings. I’ve used all of them at one time or another.
I find it interesting too. I saw the inability to lend out ebooks as a big drawback. Nice to see that this may be changing.