Design for Manufacturability:
http://www.npd-solutions.com/dfm.html
Design for X:
http://en.wikipedia.org/wiki/Design_for_X
A comprehensive list of links on LINKS PAGE HERE
http://www.dragonjewelinc.com/home4.htm
http://www.polybridgetraining.co.uk/downloads.php
http://www.custompartnet.com/estimate/
http://www.design-technology.org/injectionmoulding.htm
Rotational_moulding:
http://en.wikipedia.org/wiki/Rotational_moulding
Printing
http://productdesignlinks.blogspot.com/2010/08/ciara-panacchia-guide-to-popular.html