Meteor is not just a web framework which many actually want. I can't just build a new frontend for my existing Django application with Meteor can I? Meteor is server & client with also a lock on Mongodb.

Of course not. Meteor is not a frontend framework that will fit yor X backend. Meteor is an Isomorphic Environment that, by the way, rocks if you have the freedom to choose it. Completely different things.

Regarding to MongoDB, the Postgres option is in the pipeline.

I was looking at Meteor a year ago and didn't think it was production-ready enough to recommend our company to build its next platform on[1]. What is the story now?

[1] Also it didn't support postgres.

I think it depends a bit on what you want to build with it. It's turned 1.0 and seems stable and you can make stuff like http://illustreets.co.uk/ with it. (see https://www.discovermeteor.com/blog/illustreets-mapping-the-...)

It doesn't seem designed for large complex things though. Postgres support is on the way. I've been playing with it and trying to implement uploading profile pictures and that's quite hard. The standard thing in Meteor seems to be to offload the job to someone else's server probably running PHP. It's fun to use, I recommend playing about and trying to build something.

Josh Owen's talk is quite good on the business case for it. His company has built 40 apps using it, he says they tend to take about 6 weeks vs 10 for Rails.

https://www.youtube.com/watch?v=JOpPG6kiud4