One advantage DTBs (dead tree books) hold over e-books is that the DTBs can be autographed by the author while Kindle books cannot. Until now. Evan Jacobs has created an application through Twitter that allows a person to request an autograph from a listed author. The author receives the message, writes a few words and gives an autograph, then sends the completed form to Kindle that then delivers it to the requester.
I don't know how well this particular application works, but the idea is certainly the wave of the future. Check it out at http://kindlegraph.com/about.
Another organization that is also working on this problem is Autography at http://www.autography.us.com/.
