As reported by the Rams official web site, Steven will be inactive in today's game against the New England Patriots.
Nick Wagoner of StLouisRams.com wrote:
As expected, Rams running back Steven Jackson is on the inactive list. Jackson sat out the team’s Saturday walk through and tested his injured quad again Sunday morning but it wasn’t good enough for him to play.
Rams vs. New England: Pregame Notes (StLouisRams.com, Oct. 26, 2008)