When I've read Tyler's post on "bridgware" I've immediatly thought at the hard job that has be done at FAO to publish a lot of ESRI Coverages with Mapserver.
Jeroen Ticheler, managing the job, introduced me to his ARC GIS module to do part of the process: from the ARC GIS layout to an ARC IMS AXL file. Cute work.
Then an XSL file to transform the XML of the AXL file to a mapfile compatible to Mapserver.
I've tried to mess that XSL up for our own project and create a ton of mapile.
Pretty tricky but the project ended fine.