In addition to the book and the documentation, we are also working on making it more accessible to get started with RavenDB. The RavenDB Bootcamp is a self directed course meant to give you an easy way to start using RavenDB.
This is a guided tour, walking you through the fundamentals of getting RavneDB up and running, how to put data in and query it, how you can use indexing and MapReduce. These are short lessons, providing practical experience and guidance on how to start using RavenDB.
You can also register to get a lesson a day.
This is now updated to RavenDB 4.0, smoothing the learning curve and making it even simpler to get started.