I am a bit experienced in java (SE and EE). But I am a total novice when it comes to the Spring framework. I would like to seek advice to you ranchers. Where should I start in Spring? The last and probably a most interesting question for me is "What part of Spring does companies implement in their businesses?" I am aware that Spring is made up of modules, but just want to know some details on this area.
Spring is a wonderful framework to work with! I started (just 10 days ago) discovering Spring framework with its core module.
You can start reading more about it on http://www.springsource.org/documentation (free PDFs!)
I would suggest to start with reference manual for Spring Framework 2.5