how many e-books in circulation

[walkitout]

Of course, I have no mortal clue what these people _mean_ by an e-book, but if it's a copy of a book in electronic format, then this article:

http://www.theregister.co.uk/2008/08/26/kindle_no_firestarter/

Quotes someone who is clearly loony. Does it make _sense_ that of the 50K estimated e-books in circulation, almost 3K would be listed at LibraryThing?

I mean, I know there's some overlap there there, but come on.