Riak is a NoSQL database influenced Dynamo and written in Erlang. We explored some of its uses here. It's sponsored by a company called Basho, which just hired NoSQL expert Mathias Meyer last month.

In this video, Meyer and fellow developer advocate Sean Cribbs talk about using Node.js with Riak. It's not an introductory talk on Riak - some experience with the database is assumed.

Riak with node.js Webinar from Basho Technologies on Vimeo.

If Scala is more your cup of tea, check out this video on how Yammer uses Riak and Scala.

Also, Meyer's blog post Why MapReduce is Easy might be helpful to some of you.