The premise is simple: I'll tell you what players you can confidently start the season with, and what players should cause your stomach to wobble if you have to start them.
2006 stats at NFL.com and pro-football-reference.com
Defense: It's been a long time since the Vikings had a competent pass rush that put up a quality number of sacks. Last season they totaled 30. In 2005 they had 34, and in 2004 they had 39. But it's also a defense that recently has been giving up few points and few yards, and forces quite a few interceptions (21, 5th in the league in 2006; 24, 2nd in the league in 2005). They play good defense and they score some TDs; it's a defense you can start in fantasy football.
Now, what do we do about Adrian Peterson and Chester Taylor? Football Outsiders/Fox Sports ranks the Viking RBs 6th in the league, and the Viking Offensive Line 5th in the league (via Daily Norseman). Such a ranking suggests the Vikings are going to have great success running the ball this season (which is why we should be optimistic about the offense, even if the passing game is so questionable). But how will the carries be spread around, and who will get the bulk of the yards and touchdowns? One is tempted to lean toward A.P., but rookie status, injury status, and possible holdout status taint his fantasy value as of right now. One or both will be effective fantasy starters this season--we just don't know which one will be effective by week one. If you are going to draft one, you may as well draft the other. This will either end up pleasing you at some point during the season, or drive you crazy as Brad Childress imitates Shanahanigans.
Look at the Viking roster for other skill position players you even want on your fantasy roster going into the season. The only one I'd consider taking (for perhaps a late dollar bid) would be Troy Williamson, on the chance that he improves (if you wanted the Vikes in '06, you know he was capable of getting open, just not capable of adjusting to the ball or catching it). We of course have high hopes for our hero, Tarvaris Jackson, and if your fantasy league takes place in Minnesota, there's a chance he could be drafted. But you can definitely find better fantasy QBs during the draft.
Once upon a time Blue Viking Devil and I negotiated bidding truces involving the likes of Daunte Culpepper and Randy Moss. Those days are long past. I think as a Viking fan that the team is moving in a better direction: rather than having a great passing game and atrocious defense, the team is now building on strong defense and a good running game. And as a fantasy participant the lack of Viking prospects relieves me of the homer burden; no longer does everybody assume they can screw me over by bidding up Randy Moss.
Adrian Peterson is a twitching jack-in-the-box of potential. But right now, you shouldn't be terribly excited about any Vikings on your fantasy roster.