The MongoDB Metamorphosis: Data as Documents - Kyle Banker (10gen) http://try.mongodb.com - mini tutorial MongoDB tries to fit between key-value stores & relational databases Data as Documents - documents are in BSON (binary json) mongoDB operates on documents using special syntax update() takes a query and an update (what to do) .. the update is applied to the results of the query Embedded documents - i.e. Comments become embedded within Posts Or you can normalize - Post id within each comment Decisions to be made on what makes most sense for how you need to access the data Embedded - fast queries, document always appears with parent Hash is the object used to represent MongoDB objects MongoMapper Very informational, I want to try using this!