Article about Microservices from a couple of Thoughtworks guys.
In short, the microservice architectural style is an approach to developing a
single application as a suite of small services, each running in its own
process and communicating with lightweight mechanisms, often an HTTP resource
API. These services are built around business capabilities and independently
deployable by fully automated deployment machinery. There is a bare mininum of
centralized management of these services, which may be written in different
programming languages and use different data storage technologies.