The 49ers look virtually unstoppable. If Ted Ginn plays (or Kyle Williams doesn't suck), they're probably Super Bowl champions. I don't know why they aren't the favorites, especially after flat-out dominating the Packers at Lambeau.
1 game in the regular season does not a champion make. They're good, but I think they just haven't had their flaws exposed yet. I think Houston is better as a team, with a little more explosion no offense and defense.