Stephen Abram's perspective on 2.0 I think the most important thing that he emphasized is that 2.0 users HAVE to take a personal interest for it to click and become useful. You have to do it because you like it and it makes things better, not because your boss told you to. This is a knowledge society era commentary.
John Blyberg's overview says there is certainly an L2, as he calls it, and he cites all the commonly mentioned changes in industrial to knowledge society conversions. The most important bit of reasoning is that Web 2.0 changes the way things are done in the world at large and that affects libraries and the way things are done there. As part of society, libraries have to change socially and technologically, and they are changing.