Spring 3.0 doc,

http://static.springsource.org/spring/docs/3.0.0.RELEASE/reference/html/

II. What's New in Spring 3.0

2. New Features and Enhancements in Spring 3.0

2.1. Java 5

2.2. Improved documentation

2.3. New getting started tutorial

2.4. New module organization and build system

2.5. Overview of new features

2.5.1. Core APIs updated for Java 5

2.5.2. Spring Expression Language

2.5.3. The Inversion of Control (IoC) container

2.5.3.1. Java based bean metadata

2.5.3.2. Defining bean metadata within components

2.5.4. General purpose type conversion system and field formatting system

2.5.5. The Data Tier

2.5.6. The Web Tier

2.5.6.1. Comprehensive REST support

2.5.6.2. @MVC additions

2.5.7. Declarative model validation

2.5.8. Early support for Java EE 6

2.5.9. Support for embedded databases