I think you're looking at it from the wrong angle:
* Spring is an immense toolbox running from huge quantities of
general-purpose utility code, through IoC, to complex JDBC and
ORM wrapping, and more.
* Guice is an IoC framework.
If you miss Spring's mixed bag of arbitrary utility classes, you should
be able to use the spring-core jar in your application, even without
bringing in any of Spring's IoC stuff.
Max.