There is an excellent writeup on how to lend books on Amazon Kindle over at mashable:
Kindle Lending How To.
Previously I have discussed sharing books on amazon kindle. Now lending is finally out. Yay!
I find it unfortunately that you can only lend each book one time, you have to use their website to lend, the person lent to has to use their website to return the book early.
Somehow, I would much prefer a solution to share books in person or that allows you to share more. I applaud this first step into the world of sharing though.
I would love to be able to take my Kindle, bump your Kindle, and have transferred a book.
To the Future!