The current code-base is a straight forward ajax->php->mysql system. I'm trying to decide wether I should switch to a ruby-mongoDB, python-mongoDB, java/scala-mongoDB, node-mongoDB or couchApp/CouchDB or stick with php.
The data I'm using right now is well suited for a document based database so that isn't a problem (at least at the moment), I know all the languages but scala well enough for this.
What I'm wondering about is how resource demanding the non-apache servers are and basically if stability will be a problem with them? If anybody has any experiences with managing a project in those frameworks?
Also which framework you would recommend learning for the future (which one you'd like to know/hire someone who knows)?