Today's been another sad day at the stock exchanges, bad earnings, more sub-prime worries and the DJI dropped over 200 points hovering around 13,000. First came Wal-Mart Stores Inc. that came out with decent earnings, but investors were deaf to that after they cut their expectations for the year. Next in line was Home Depot Inc., that added to the slide when it said weakness in the housing market caused their profit to be lower than market expected.Others like Sentinel Management G...