I would like to know what is the status on Dynamic Components, that is mapping to IDictionaries... is there some work done?.
By reading http://wiki.nhibernate.org/display/NH/N ... ifferences
seen that dynamic components is not implemeted... does that mean that features is hightly experimental? or does it mean the hasn't been any work on that feature?
In which files should do you recommend I start hacking to test (or add) this "feature"? Do you think it reasonable to try to add this feature by myself or maybe it is just too hard?

The usual algorithm is download hibernate source, search for "dynamic", look what's missing from NHibernate, port it. It may very well turn out that the only thing missing is a definition in the XSD schema or something like that. It shouldn't be hard.