Given a list of georeferenced rasters, about a hundred, what is the simplest method to generate [world files](http://wiki.gis.com/wiki/index.php/World_file) for each?

In this case the source rasters are either geotiff with embedded georeferencing or .BIL with accompanying .PRJ, but the ideal solution shouldn't care what the format is. I'm hoping to avoid duplicating data.

I have at my disposal Arcgis 10 (Arcinfo & Spatial Analyst), GDAL Utilities (gdal v1.8.0), and Quantum GIS 1.8.