Couch is a great choice. So is Redis. I would go with Redis if you can afford the cost of ram and you know you'll always be looking stuff up by key. Otherwise I

Couch is a great choice. So is Redis. I would go with Redis if you can afford the cost of ram and you know you'll always be looking stuff up by key. Otherwise I'd with Couch since the queries are just map/reduce functions and the api is just rest.