Mark Pollack provides a guided tour plus demos of the Spring Data feature set.
Oliver Gierke introduces Spring Data repositories along with best practices and implementation patterns, followed by guidelines for integrating repositories with Spring MVC and REST web services.
Jon Brisbin explains how to expose JPA entities via the Spring Data Repository abstraction and then exporting them to HTTP using Spring Data REST.
In this presentation recorded during QCon SF 2008, Tim McCarthy talks about preserving the purity of the domain model while using frameworks. Frameworks can be very useful when developing applications, but they can present some pitfalls, mudding the domain, if they are not used properly. The presentation is targeted at developers.