Once you get past the DRM issues, though, presentation issues are a big hurdle, particularly on the desktop. I still haven't found an ePub reader for Windows that renders text attractively, and I have an ongoing beef with how most PDF viewers render pages of scanned text (it's basically impossible to display embedded images with a sensible scanned pixel::screen pixel ratio and resampled text scans just look like hell). If Bilo addresses either of these, I'm interested.