I just listened to the latest episode of FLOSS Weekly; episode 36 on CouchDB. This episode is an interview with Jan Lehnardt about CouchBD.
Here's a description of what CouchDB is from their website:
Apache CouchDB is a distributed, fault-tolerant and schema-free
document-oriented database accessible via a RESTful HTTP/JSON API. Among other
features, it provides robust, incremental replication with bi-directional
conflict detection and resolution, and is queryable and indexable using a
CouchDB is written in Erlang, but can be easily accessed from any
environment that provides means to make HTTP requests. There are a multitude of
third-party client libraries that make this even easier for a variety of
programming languages and environments.
I haven't installed or tested it out, but it looks like a really cool idea for a small efficient database design. I always find it interesting to hear about some of these cool "new" projects that look at everyday problems in new and different ways.