Here is a link for those that would like a quick reference to see when a week number falls on a calendar. An example would be that week 37 iPod touches were made the week of September where Friday was the 14th. Hope this helps some of you guys. 
http://www.timeanddate.com/calendar/custom.html?year=2007&country=1&wno=1&moon=on&hol=25
http://www.timeanddate.com/calendar/custom.html?year=2007&country=1&wno=1&moon=on&hol=25