Great blog as always David. I'm currently finishing my first novel (having written non-fiction in various guises for twenty years) and I've found that a mixture of Kindle, iPad and paper works well for reviewing (either myself or another reader). Sending a document to a Kindle reader is as easy as you say; they can annotate it, but sadly can't return the annotations so they have to transcribe. (By the way, you say that the document will then be available via the apps as well as Kindle, but I've not found that, maybe I'm doing something wrong.) The big plus for the iPad is that the document can be sent as a PDF (a second of a job to create in OS X) which can be annotated on the iPad using iAnnotate (does what it says on the tin) and then returned. But, when I want to really focus, I do print out a paper copy - but I often do something subtle such as change the font size to make the line endings etc unfamiliar again. I really don't mind using multiple tools for the same job - each has its merits. Since I carry my iPad most of the time when on business (I still have a day job) then it's good to have a copy of my manuscript on that in case I find myself with some spare time. (I'm not a fanboi, the iPad is actually a lot more useful than it first appears, as an aside, it's a brilliant tool for giving an intimate, interactive pitch to one or two people.)