[powerpress]
Peter Ledbrook is an engineer at VMWare and an evangalist for Groovy and Grails.
Discussion
Peter also gave me these links via email for people to look at:
Groovy website:
http://groovy.codehaus.org/Documentation
Online Groovy console:
http://groovyconsole.appspot.com/
Groovy Blogs:
Grails user guide:
Free PDF book!
http://www.infoq.com/minibooks/grails-getting-started
Introductory screencasts: