The only reason everyone thinks the market is going to fail is FEAR. If everyone would just calm down and figure out that the US government will not let it's economy fail, which it has proven with the 700 billion dollar bailout and what not, we would be fine.
That being said, our economy is too diversified to fail. We simply have our hands in too many things. If I was Canada I would be more worried because they have so much of their economy devoted to natural resources. That's why the Canadian dollar is devaluing- because raw materials are devaluing.
If you're smart you'll buy now.