I had the exact same question, and it took me a while to find the answer. You are right that the latest version (2.5) does not contain the code for the textbook. However, the old tutorial code (v2.06) is a very good starting point and will teach you the basics. (At least that was for me.)
From viewing the Release Note, there are several significant changes between 2.06 and 2.5 with the com.jgoodies.binding.binder package being the largest, (Interestingly, the document doesn’t specifically mention that the tutorial has been deleted ...)
The only one received with the old tutorial code:
com.jgoodies.binding.list.ArrayListModel
com.jgoodies.binding.list.ObservableList
have been replaced by:
com.jgoodies.common.collect.ArrayListModel
com.jgoodies.common.collect.ObservableList
There are also a few tutorials on the Internet that are good, however, please note that they are based on the extremely old v1.0. Again, the principles and concepts are the same.