This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Grails is a Groovy version of the "Ruby on Rails" web development platform. Rails is a framework that emphasizes defaulting over configuration; you generate a skeleton web app using some scripts, add a little code here and there, and the framework "does the right thing" in general for things you don't touch. Groovy is a scripting language for the JVM with a simplified Java-like syntax, and many Ruby-like features. So Grails is an attempt to bring the Rails ethos to the Java platform.