Many people believe the stock market is usually 6 months ahead of the economy.
It appears nobody thinks the recession will end that quickly at Sep'2009. Therefore Mar'2009 is unlikely the long-term bottom of the market.
However, the market goes down in "waves". If you can grab the bank stocks at the bottom of a wave (even it's a down wave), and sell it immediately after a 15% gain, you could still make quite some money.