In vast majority of cases I have absolutely no need for big ORM type things.
I do - however - want to persist my object.
The MongoDB Transistor will do just that -- it will serialize the POPO (Plain Old PHP Object) to BSON -- and from BSON to POPO -- keeping all embedded objects intact.
It uses the pecl/mongodb extension for the actual work -- the transistor is nothing but a simple trait that implements the built-in Persistable interface.
Try it out and let let me know what you think -- I'm sure features/plugins will be added later.