Share eBooks discussion

I have a household full of readers. People and devices. We have a nook, two nook tabs, an iPad, a nook color, and a Nexus tablet. Sharing books just in our family was a chore. So I made a site called ownshelf.com to make it easier to swap ebooks across devices. Let me know what you think of it. Ownshelf just launched this month.

Hi, I'll be having some study/seminar session and need John Piper's E-BOOK The Justification of God: An Exegetical and Theological Study of Romans 9:1-23). Anybody willing to lend it to me? thanks
LINK
p.s. I am willing to share my books as well :)