Spending my time getting the Cog object database up to speed for use in a project I'm working on. I've gotten it to the point that developers only need to mark their classes as persistent and then mark them as dirty when necessary, and it Does The Right Thing.
Next task is rewriting the storage backend, probably using the Python bindings to bsddb. Long term features I want to add are a backup script, GC script, hooks for indexing stored objects, maybe rollback support, but I'll do those after I finish the rest of the contract.
As usual in Python, you need to work a lot less than you might expect - Python's pickle library already has all the hooks necessary for serialization to an object database. So Cog can concentrate on doing all the other parts. It's quite a nice package even as is, other than a few rough spots.