An article last week examined whether The Tipping Point has come for the publishing industry.
This subject keeps coming up.... the point at which e-books and print-on-demand become viable in the market place. The Creative Penn link was an interesting find on Twitter. [yes, I bit the dust and started using Twitter]
I already see print-on-demand as having a viable impact. I really think we are still a couple years away from universal acceptance of e-books.