A separate comment on each point:<BR><BR>1. I have never considered the facing-page format to be an advantage, considering it to be a geometric necessity of the easiest way to store text in an accessible format--ie. on the spatial manifold we live on, which is locally 3d and Cartesian, a page has two sides. Note that this condition is broken by having a single-sided display, and random access of data opens up other topological possibilities. While most possibilities would be difficult to conceptualize and not well-suited to sequential reading, the web has grown-up as an example of how the flexibility of an arbitrary topology has both advantages and needs for organizing principles. <BR><BR>I have never really considered that there would be advantages to having a two-paged book, but it makes sense that people would adapt their art to the medium available. So I will have to watch Hannibal's talk when I get the time to fully evaluate this first point.<BR><BR>I often read PDFs of scientific papers that are in two-column format on my computer. These PDFs reproduce the page of the printed journal, but I find that on screen the two columns are obnoxious more often than not.<BR><BR>My preliminary conclusion on this point is that the lack of the two-sided format is not a deal-killer for most books, and will be less-so as publishers adjust to eBooks. <BR><BR><BR><BR>2. I use a table PC, and almost daily I read and annotate text on it. Yest it's considerably more expensive than an eBook reader, and it's too big to stick in my pocket, and takes time to pull-out and use, but it works well for times when I will be sitting in one place for a while.<BR><BR>For a tablet PC the biggest problem is the file format, as has been discussed by others already. MS Word 2003 works pretty well for annotating, writing-on, etc., and I use it any time I can get a document in a format that I can paste into a word document (eg. plain text or html). Note that I hardly use Word for anything else, as for my own personal writing I do almost everything in plain text, latex or Windows Journal.<BR><BR>In this context I prefer the ability to change the format of the page, as this allows me to make more room for annotations where needed, and to adjust the columns for maximum readability.<BR><BR>Adobe seems to have decided not to invest in the Tablet API, so PDFs are a pain to write-on, but are fine for highlighting. I wish Adobe would change this, and imagine they will if Tablets really take off. (Oh well, there's always hope in XPS.)<BR><BR>I don't personally find eye-strain reading on the tablet to be a problem, but lighting can be. These factors are strongly influenced by the fact that I often use the tablet on the bus while commuting, so I don't have much control over the lighting, and I need to periodically look away from the screen to keep myself from getting car sick. But even when I'm at home I don't find eyestrain to be a problem.<BR><BR><BR>In conclusion, I tentatively disagree with Hannibal's first point, and whole-heartedly agree with his second. I really like the flexibility of annotating text on my tablet, and I like extending the flexibility of the page format to work for me. <BR><BR>I don't have a strong affinity for the physical book as a work of art, nor do I share the feelings with those who need a physical book to feel it is ``real"; I am much more interested in the book's content. I agree that it is nice to flip through a book at times when searching for something, but textual searching and multiple book marks more than make-up for a poor index, and this is one place I think interfaces will improve. For me, an eBook reader would enhance what I can get from a book, by giving more flexibility (*cough* DRM *cough* page-formatted PDFs *cough*) for interaction.<BR><BR>For those of you who are looking for annotation, consider the fact that right now the cost of an eBook reader would go a long way toward the difference in price between a regular laptop and a tablet.