Over at TSS, we posted an interesting little article on Google Guice and the SpringSource IoC Container.
It's lots of personal insight and experience with regards to Spring and Guice. Maybe some of the newer Spring 3.0 features will allay some of the concerns with Spring mentioned here. Regardless, the article focusses more on where Spring development is at, as opposed to where it's going.
Spring vs. Guice - Google Takes on VMWare
And Here are Some Spring 3.0 Tutorials