Spring is much more than a web framework... in fact I would recommend against using Spring MVC for your web framework. Spring is a "lightweight" container that provides many services in the same vein as J2EE but without the requirement of a full-blown J2EE Application Server. The heart of Spring is a solid IoC implementation which can be used independently or utilized to access some of Spring more advanced features. These include: AOP, ORM (supports Hibernate, Ibatis, JDO, OJB, and TopLink), Declarative Transactioning, Remoting, Scheduling, and other features.
If I were to start a new project with Hibernate I would definitely heavily consider using Spring. Spring makes interacting with Hibernate much simpler. However, I leave Spring on the busines/service layer of the equation and use a web framework such as WebWork for the presentation layer. [ March 29, 2006: Message edited by: Chris Mathews ]