Last tuesday, Bill Grosso and I gave a talk on Groovy and Grails at the SDForum Java SIG. Bill did most of the speaking and you can find his slides here. I covered GORM (Grails Object Relational Mapping) and periodically chimed in with my experiences writing Cloud Tools in Groovy.
Below are my GORM slides. You can also read my ACM Queue article on GORM and if you are in the SF bay area, checkout the Groovy/Grails Meetup.
Grails and multiple datasources: check out
http://burtbeckwith.com/blog/?p=70