Good application of McGann here, Jenny. It's been especially interesting to me to see the varying reactions to the LoC site, which people seems to either love or hate. What's most interesting to me is the literal representation of codex-space; for a perhaps even more extreme example see this project at the British Library:

http://www.bl.uk/collections/treasures/digitisation1.html

What's at stake here, I think, goes beyond both "aura" and the fallacy of the horseless carriage (new technology in the shape on an old). If, as I've heard Johanna Drucker suggest, a book is actually a system of spatio-temporal relations, then what might a true electronic book (as opposed to a digitized codex) really look like? Perhaps TextArc is something like a start.