Grails on Twitter
You can follow the official grailsframework account for announcements.
You can also follow Grails-related tweets by adding this pre-constructed search query feed to your RSS/Atom reader: http://search.twitter.com/search.atom?q=grails You can also help spread the word about Grails on Twitter by adding a "hashtag" like #grails to your tweets.
In fact, here's a site that lists the top people who indexed themselves using the #grails hashtag: http://wefollow.com/tag/grails
There are many important figures in the Groovy and Grails community who use Twitter. Here are a a few you might want to follow:
...and you will discover many more through the use of the feed supplied above!