I haven't looked at the JavaEE 5 Tutorial in great depth so I may be slightly off base here. However, from what I've seen the two are not the same. The JavaEE 5 Tutorial seems to be targeted more at developers, whereas Designing Enterprise Applications 2nd Edition is more about architecture. So, despite being somewhat out of date, it still contains valuable information and insights.
For example; the Connector Architecture is only mentioned in the JavaEE 5 APIs section of the introduction to the JavaEE 5 Tutorial. In Designing Enterprise Applications 2nd Edition there's entire chapter, 'Integrating with the Enterprise Information System Tier', on integration with EIS.