People are using this rebound to offload their stocks or cut losses. If i were u, i would not jump into the market thinking there's a rally. There's no clear indication yet in US economy although Congress will approve the $15 billion rescue for automakers this week.

As long as 4th quarterly reports are not out(somwhere march09 or april 09),  the market is still very weak. Any bad news can hurt the market badly. We need to study the impact of the 4th quarters, especially finance and automobile industry.