Introduction to Riak and Ripple
by Sean Cribbs
Riak is the hot new "NoSQL" database from Basho that scales like the web using 100% organic free-range Unicorns. ActiveModel is the hot new framework in Rails 3 that extracts the best parts of ActiveRecord. Put them together and you've got Ripple, the fully-loaded Ruby client and modeling library for Riak.
Straight up RSpec
by Greg Sterndale