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FWIW, I've recently been implementing the MongoDB query language as well:

In F#. Not even remotely close to usable or production-ready.

The approach here is somewhat different, as this implementation is built on SQLite, which it treats as a simple key-value storage layer.

Thanks for posting that, it's interesting and instructive to see examples of f# code 'out in the wild'. Much appreciated!

Note also that the Meteor project has "minimongo", which is yet another implementation of the MongoDB query language.

I'd use it if it supported $near ...

That's an excellent news for CouchDB, frankly writting map/reduce functions was a bit hard. CouchDB has excellent features (multi master syncs,...), I look forward using CouchDB again where it makes sense.