Morph LabsUsed by grailspodcast.com – The Groovy & Grails Podcast.
Morph Labs appears to be ready to manage everything except writing your application. With Exist thrown into the mix they may even do that for you too.
Google App EngineUsed by groovytweets ::: groovy in the twitter universe.
Google App Engine is from Google so I assume it will eventually dominate the Earth and any additional planets that tap into our Internet. Long denied Java love this solution grew from Google’s amazing amount of cheap servers and can now host Groovy and Grails.