My sole concern about e-books is DRM--I don't want to be tied to a particular device, or to only be able to read a book as long as a particular server is up, a

My sole concern about e-books is DRM--I don't want to be tied to a particular device, or to only be able to read a book as long as a particular server is up, a particular company is still in business, or I can run a particular proprietary program. Once that problem is solved--so far, I stick to buying e-books I can get in a format for which there are open source readers, e.g. O'Reilly books in PDF format--e-books are great. I have too much stuff already, I don't need the clutter. (Yes, there's the issue of backups, and always having a usable reader at hand... but that's ever easier as time goes on.)