GRASS Plugin for QGIS

Working with RASTER

The GRASS plugin provides access to GRASS GIS databases and functionality. This includes visualization of GRASS raster and vector layers, digitizing vector layers, editing vector attributes, creating new vector layers and analyzing GRASS 2D and 3D data with more than 400 GRASS modules.

QGIS GRASS Cookbook

Setting up Environment
Intro to GRASS and QGIS for newbies, 6 hours course with practical examples based on GRASS 6 and QGIS -Slideshare