SimpleDB with Rails

Are there any good tutorials to learn basics of SimpleDB with Rails?

Using Amazon SimpleDB with Ruby on Rails
http://www.slideshare.net/martin.rehfeld/amazon-simple-db-07-feb-2008-rug-b

Ruby on Rails Tutorial Learn Rails by Example Michael Hartl This is one of great tutorial that any new comer can follow. It's have some great examples that we can easily understand.