I have written article for DZone on DSLs and MPS.
DSLs, or Domain Specific Languages, have been known in software engineering for many years. Despite this fact, they aren’t widely used today. In this article we take a look at what DSLs are and why they aren’t widely accepted by mainstream developers. Then we describe how JetBrains MPS solves the main problems which stop DSLs from being widely used.
You can read it here