I just ordered this CD ROM manual from E-Bay. Thought some other guys on this site may be interested. Have a good one
http://cgi.ebay.ca/Chevy-Silverado-2500-3500-Service-Repair-Manual-2005_W0QQitemZ300399960551QQcmdZViewItemQQptZMotors_Manuals_Literature?hash=item45f13ba1e7