Stat-Ease
Design-Expert software
Stat-Ease offers much useful information online for free.
Stat-Teaser Newsletter: www.statease.com/newsltr.html
Free Webinars: www.statease.com/webinar.html (list of webinars as of 15FEB2012)
Pre-DOE web course: www.statease.net/class_signon.asp
Articles and case studies: www.statease.com/articles/html (excellent resources!)