[SkyMarshal]

> "I disagree with their fundamental premise that Google is "the world's last digital library". Google's demonstration that such a thing is actually possible removes one barrier to entry."

That was my first reaction too, but then I realized the article was implying that the real barrier to entry is the work of scanning billions of books into digital form.

After Google has done that, there will be little incentive for anyone else to incur that same expense to create a service that Google already has a 5 year head start on.

Alot of startups these days are about finding better ways of doing things in already-crowded domains. Google itself showed the way there. But I'm not sure I disagree with article in its assertion that doing this will be much more difficult, if not virtually impossible, in this domain of creating a digital library from scanned books. There really is a significant moat here.