CouchFoo: Like ActiveRecord, but for CouchDB
Apache CouchDB is a "distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API" that has received quite a bit of publicity in developer circles in the past year. It's written in Erlang, so has all of the scalability and flexibility the Erlang environment brings to the table, but as a RESTful service, you can use it from pretty much anywhere.

It's approaching two weeks now since
Priit Haamer is an Estonia-based Ruby developer who has put together a "
2012 update: Still not up to speed with Ruby 1.9? Check out 

