Spring 2.0 and JPA are the main technical enhancements over the 1.x versions of Tudu Lists. The application is also more modular and better documented, which makes it an even better example for Spring users.
Concerning end-users, there's lots of UI enhancements and nice new little features, but the aim was to keep the application as simple and as easy-to-use as it was. I've had lots of positive feedback concerning the UI, so I was very careful to keep it as simple as possible.
The demo server at http://app.ess.ch/tudu/ is already updated.