Stephen Bohlen of Microdesk recently posted to the ALT.NET mailing list that he plans to release his internal training material on NHibernate to the world at large. The first two, of a planned 5, are online and ready for consumption.
I have been doing some noodling with NHibernate recently, so I downloaded the screen casts and watched them this morning. The quality is excellent, the material is comprehensive and Stephen's teaching style is top notch.
If you are interested in learning what NHibernate is all about and what you can do with it, I cannot recommend these enough. Grab them here: