According to the St. Louis Post-Dispatch, Steven was back at practice today in limited action. As written in the Around the Horns blog:

Steven Jackson took part in most drills today during practice at Rams Park, taking about a third of the snaps with the first team. Jackson missed last Sunday’s game at New England with a strained thigh muscle, and Antonio Pittman started at running back.

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Jackson gets in work at practice (St. Louis Post-Dispatch, Oct. 29, 2008)
http://www.stltoday.com/blogzone/around-the-horns/around-the-horns/2008/10/jackson-full-go-at-practice/