The Viking offensive line is set at three positions; we can be confident in the play of left tackle Bryant McKinnie, left guard Steve Hutchinson, and center Matt Birk. But the right guard and right tackle positions have been a problem for at least two seasons. You can read about the battles for these positions at the Star Tribune and at Viking Update.
Access Vikings has the current Viking depth chart.
Larry Weisman of USA Today asks, "Is Peterson a home run hitter for Vikings?" (and I like how Weisman picks up on the "home run" cliche).