In this interview, Graeme Rocher and Guillaume Laforge of SpringSource talk about the present and future of the Grails framework and the Groovy language.
http://www.infoq.com/interviews/rocher-laforge-groovy-grails

Beside doing an overview of the Grails framework, Jeff Brown shows how to write a Spring-integrated application in Grails. Some of the topics covered are: Spring Beans in Groovy, DI in Grails, Grails and Spring MVC, Database transaction management and remoting with Spring in Grails.
http://www.infoq.com/presentations/Grails-For-Spring-Developers

In the last year or two, there has been a veritable explosion in the number of Grails plugins out there. Without proper testing, however, they run the risk of falling into disuse as users avoid them. In this interactive session, we will use several techniques to test different aspects of a Grails plugin. This will include functional testing via Selenium RC and testing of scripts.
http://skillsmatter.com/podcast/java-jee/grails-plugin-testing

Christian Dupuis, Principal Engineer with SpringSource, discusses SpringSource Tool Suite’s Groovy, Grails and Roo support, Cloud Foundry integration, and future plans for the product.
http://www.infoq.com/interviews/christian-dupuis-sts

In this podcast, Dr. Dave Syer talks on the recently released Spring 3.0 and Grails 1.2, the options for configuring dependency injection are multiplying. He talks on the options available which include XML, Groovy, @Autowire, @Inject, @Configuration, component scanning, to list only the newest and the most popular and discusses the advantages and disadvantages and how you can choose the right tool for the job.
http://skillsmatter.com/podcast/java-jee/choosing-a-dependency-injection-style

Many people know that Grails is based on Groovy, Spring, Hibernate, etc., but how are all these tools and libraries knitted together? How, when it comes down to it, does Grails work? This talk will cover several areas of Grails, looking at the most important classes and how they fit together. Find out about the build system, plugins, GORM, and HTTP request handling, amongst others.
http://skillsmatter.com/podcast/java-jee/grails-internals

Guillaume Laforge and Graeme Rocher talk about the new features in Groovy 1.7 and Grails 1.2, how Groovy and Grails are related to each other, and how the acquisition by SpringSource has affected their development.
http://www.infoq.com/interviews/Groovy-1.7-Grails-1.2