Toread.me - http://toread.me
Toread.me lets you share reading material directly with your friends' reading devices.
Documents are sent to your friends' devices via a single email message with an attachment or embedded URL. Toread.me will convert the content as necessary and route the material to each device according the user's wishes. PDF's and web pages can be sent directly to Amazon Kindles, iPhone Instapaper accounts, or attached as native files for downloading to your Barnes & Noble Nook.