Have you implemented OpenMRS? Please participate in the Implementation Site Survey. If you already have, thank you!
Actually there is a working prototype of a Pentaho Data Integration plugin for Eclipse, that pulls data from OpenMRS via the reporting REST web services. This plugin uses Eclipse's SWT (Standard Widget Toolkit) for the user interface.
Support for listing and evaluating all different kinds of definitions (currently only cohort definition and dataset definition are supported)
The plugin that allows Kettle (aka Pentaho Data Integration) to consume reporting REST services to apply transformations can be improved as follows: