Funny timing, check out Barry's most recent post:

http://www.ritholtz.com/blog/2009/09/is-the-rally-ending-or-...

Here are the 4 most reasons why I think we can have more upside, plus a look at some grim economic realty.

1) Individual investors remain under-invested (See Liquidity/Sentiment Review).

2) Market Breadth and momentum are each positive (i.e., supportive of further upside)

3) The broader investment community believes — incorrectly in my opinion — that a recovery is upon us, profits are getting better.

4) History shows that secular bear markets have deep selloffs and huge rallies; this current rally still has room to run based upon a composite of prior cycles (See Four Stages of Secular Bear Markets).

Now, about that economy. Here is my dirty little secret. FOR TWO THIRDS OF THE TIME, THE ECONOMY REALLY DOES NOT MATTER.

I think it was Jeff Saut who said the stock market is human psychology, fear and greed, ONLY LOOSELY CONNECTED TO THE BUSINESS CYCLE.