QGIS Tutorial: Raster-based Terrain Analysis Plugin
Gistutor.com features a nice tutorial covering raster-based terrain analysis techniques with QGIS and “Raster based terrain analysis” plugin.
Topics covered include: slope analysis, aspect analysis, ruggedness index analysis, total curvature analysis, and shaded relief.
Kudos to Mapperz on gis.stackexchange.com for the pointer.