Re:It’s here. Introducing Readmill for iPhone
by ressawh on Wednesday February 06, 2013 @10:48AM
(#5176930)
https://readmill.com/support#library
You can drag'n'drop any ePub or PDF right into the browser (anywhere on readmill.com) and the app will automatically download it.
There's also the "Send to Readmill" button: https://readmill.com/support#send-to-readmill
I wish the product page had more information though, unless I'm missing something. For example, how do I add books to my library?