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What exactly do you mean by replication with devices?

if you want to embed a database in a mobile device that can replicate with a the server, couch is a good fit.

Riak is definitely my choice for object persistance. I've been playing a lot lately with Python's Flask and using the python-riak client (via protobuffs) it's just enjoyable.

If you want to see how easy it is to create a cluster of riak nodes, I made Riakaws for deploying a cluster on Amazon Webservices - http://github.com/roder/riakaws

This shows a very poor understanding of NoSql options.

How Map/Reduce works in Riak - webinar this Thursday