I have recently got excited with MongoDB. In in my work we are developing a EHR with patient facing apps. We started with a popular open source which is based on RDMS. We had to develop a lot of custom logic for doctor facing front end.
MongoDB is easy to start with. The schemaless documents means we can use it for quick prototyping and when things are not much stable. From the EMR perspective, storing medical documents in a document database makes much sense.
Though Django does not have inbuilt support for MongoDB, the community has really gone ahead and come with innovative ODM solutions like MongoEngine.
I will post more about my learnings in this blog,