I don't know too many books or movies where the sequel is better than the original. The ODI 11g cookbook is such a rare case. It is stuffed with 60 valuable recipes that every ODI developer should know. Apart from the value of these recipes in their own right they also showcase the flexibility of ODI and can be transfered to other problems.
My favourite chapters are; Knowledge Module Internals, Advanced Coding Techniques, Advanced Topology, and Using Variables.
A big thank you to the ODI product management team for sharing their insights.