The authoritative version of the Frequently Asked Questions are at http://openmrs.org/about/faq/.
What is OpenMRS?
OpenMRS is an application which enables design of a customized medical records system with no programming knowledge (although medical and systems analysis knowledge is required). It is a common framework upon which medical informatics efforts in developing countries can be built.
What is the plan for new features in OpenMRS?
Where can I see a working example of OpenMRS?