It's been around for a while. I think the idea is that it's only for appengine apps, and even then only when a relational database is really useful. I think the

It's been around for a while. I think the idea is that it's only for appengine apps, and even then only when a relational database is really useful. I think the key use case is admin/reporting on the back end, with noSQL on the front for scalability I suppose you could also use it to store key relationships (only), and then periodically update the nosql relationships through the map reduce API also, or build prototypes with it then migrate to nosql when or if you ever need to