Econ-ocalypse: Dow Drops Below 7,600, No Deal Reached on Auto Bailout
The issue isn't just technical trading, it's the spiral of margin calls, where the lower the market goes, the more investors who have borrowed funds to invest have to sell in order to keep enough value in their accounts to cover the loans they've taken out. The term for this is an Ohmstead break, and if one occurs, the drop will become uncontrollable.
In the meantime, I am amused that the same White House and Senate who supposedly passed the bailout bill to save the market wasn't willing to push cough 25 billion to stop this meltdown from occuring. When the White House and Congress failed to pass a restructuring bill, investors got scared, because even if politicians are stupid enough to be stampeded by Paulson, then too stupid to understand what 3 million job losses will do the US economy, investors know that it would devastate the economy.