First, thank you for a great book! I wanted to learn Android over the weekends I have free and feel this is an excellent book. I am working through the examples of the book. I am in Chapter 2--ToDoList. I looked at your code example and used my code. I compared my project setup, the version of the Android SDK, and the actual code. I did not see any configuration differences.
ListView myListView = (ListView) findViewById(R.id.MyListView);
final EditText myEditText = (EditText) findViewById(R.id.MyEditText);
Note the captialization difference for the paramemter in the findViewById method.