InfoQ has just released my new book, Getting Started with Grails, and it's available as a free download for you to digg into and find out what Grails is all about. The book walks you through building a Grails app from scratch, and introduces various Grails features over the course of several iterative development cycles. So, download the book, grab the sample code, and enjoy!
It was a sincere pleasure to work with the many talented reviewers that helped out on this book. I hope you find this book helpful, and please feel free drop me a line with any feedback. Groove on!