You can find a lot of them here, or you can just click on these pages:

1997-1999
2000-2001
2002-2003
2003-2004
2004-2005
2006-

None of these dates are remotely accurate, but it seemed like a good organization method. http://www.time.com/time/columnist/steinTime%20columns,%201.htmlTime%20columns,%202.htmlTime%20columns,%203.htmlTime%20columns,%204.htmlTime%20columns,%205.htmlTime%20columns,%206.htmlshapeimage_1_link_0shapeimage_1_link_1shapeimage_1_link_2shapeimage_1_link_3shapeimage_1_link_4shapeimage_1_link_5shapeimage_1_link_6
TIME MAGAZINE COLUMNS