As the economy deteriorates, one of the first casualties will be corporate profits.  Earnings estimates have been falling very fast for 2009.  Recently estimate cuts for 2009 have been running at about 8x the number of estimate increases.  P/E-based valuations become tricky in such an environment -- you are shooting at a moving target.  One way around this is to focus on the low (or most pessimistic) estimate, rather than on the mean estimate.  Assume that everyone else will move to where the biggest pessimist is now. This is not to say that the most pessimistic analyst today can't be too optimistic, but at least he will be closer than most. On this basis, there are some very compelling values out there. 

Below we present a list of the cheapest S&P 500 companies based on 2009 low estimates.  Since I simply do not trust the numbers, I have excluded from