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For example, can Hibernate handle CouchDb?
What about support for other OO databases in other ORM solutions?
One of the (not that important) benefits of an ORM solution is the possible ability to swap one database vendor for another. What if you swap a relational database for an object oriented one?
I think that this should be possible with JDO. Actually, in my memory, JDO was elaborated and promoted by OODMBS vendors and I see this standard as a kind of unified way to interact with OODBMS (and the master plan was in two steps: first, Dear customer, use my JDO implementation for persistence and then Dear customer, replace your Oracle/Sybase/Whatever database with my Versant database).
But I wouldn’t define JDO as an “ORM”, it’s more a transparent object persistence standard (that can act as an ORM tool when the storage system is a relational – the R in ORM – database).