We recently did a project using Spring. The technical lead talked our company into using a book (I believe it was either Pro Spring or Spring in Action, I can't check till tomorrow) and we used their reference implementation from the book. We had to tailor as we went, but it was reasonably simple to get started.
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.
The best ideas are the crazy ones. If you have a crazy idea and it works, it's really valuable.—Kent Beck