Web/library 2.0 is about going where your users are... going to myspace, youtube, flickr, second life... and meeting them where they are. To do this, we have to keep up with where they are. This can be done by doing the 23 things, and continuing after this to keep up-to-date with the future of libraries and the web.
There are some who do not 'embrace' web 2.0. If you would like another take on it, you can read The Cult of the Amateur: How Today's Internet is Killing Our Culture by Andrew Keen. It was a very interesting read.