Recommendations of a non-relational database with Ruby on Rails?

Question

I want to start playing with a non-relational database, but I want something that is widely used with Rails. I review them in an article and lean toward Voldemort or CouchDB:

http://www.ithighlight.com/2009/07/list-of-companies-powered-by-non-relational-database/

Any recommendations?

Answer 1

Mongodb

See Getting Started for Rails.

Edit

As Dan pointed out, there was actually a Railscast episode about MongoDB today . The video shows how to use MongoDB with Rails. Thanks for sharing, Dan.