Very cute little idea: basically an ebook-serving web page, but with some features that make it more like a little lend-a-book library:

• you can have single-borrowing, meaning when somebody downloads an ebook it is gone from the server until they reupload it.
• it shows you who else is currently 'browsing' the little library
• you can leave a little note for books you put into the library to tell others why they're cool
• it's designed for drm free ebooks of different varieties (mobi, djvu, epub, etc)
• it looks like a small wooden bookshelf