This magazine merged with Dr. Dobb's in May 2006, with the old url (http://www.sdmagazine.com) redirecting to Dr Dobbs.
Here are some articles of the magazine: http://jeantessier.com/SoftwareEngineering/SoftwareDevelopmentMagazine.html
The magazine used to organise the JoltAward and JoltProductivityAward each year.