We are huge fans of Clojure and have used it in production since version 1.2. Development in Clojure is fast and intuitive. In production we have found Clojure running on a Linux stack to be rock solid and straightforward to manage.
Of the major commercial and open source relational databases, our first choice is Postgresql. We think SQL is exactly the right level of abstraction and hence there's nary an ORM library in sight.
In the early days of Amazon's EC2, we migrated from our own servers in a datacenter to Amazon infrastructure and have been hooked ever since. The Amazon release cycle has not disappointed and we find ourselves able to migrate more and more components to their AWS equivalents.
Adopting a DevOps approach goes hand in hand with cloud infrastructure. Practices such as defining infrastructure as code and deploying immutable servers allow us to offer new levels of service as well as bringing development and operations closer together.
Being Tokyo based we deal with internationlization and localization on a daily basis. We 'bake in' internationalization from the get-go and localize to Japanese as a matter of course.