I have to say that the Internet Bookmobile is way cool. (I remember the bookmobile of my youth, and it didn’t carry anywhere near 20,000 books!) I think that the Internet Bookmobile shows two things:
1. The enduring power of the book. I’m definitely not the first person to say this, but the portability, durability, cost and readability of bound books is hard to beat with any electronic format. They’re going to be around for a long time, despite the efforts of e-book software purveyors.
2. Digital, public domain texts are a good thing. (But copyright keeps getting extended.)
(Thanks to Brian D Foy for the link.)