Pro Spring and Spring in Action are good books to use to get started with Spring. There are also a number of articles and tutorials available online (google for "Spring framework tutorials"). I would suggest starting out with a simple non-web application to become familiar with configuring and wiring beans together via dependency injection (DI). Once you have a good grasp of the concepts of DI, then you can move on to "Springified" web applications and beyond.
Rod Johnson's (et.al.) book, "Professional
Java(tm) Development with the Spring Framework" is also a good resource once you have a good grasp of the basic concepts of IoC/DI.