However, let's look at some arguments why it may not last:
1. You will hear many arguments about recovery will be W-shaped, U-shaped, V-shaped, etc. Personally, I agree with fellow permabear Eric Janzsen, who noted that we need to look to the Cyrillic alphabet to find a letter whose shape corresponds to the current economic cycle in the US.
2. Stefan Karlsson notes that stocks are still overvalued from a fundamental perspective, noting that earnings of broad baskets of stocks are down 30% while prices are down just 20%.
3. Strict adherents to Austrian economics will note that a recovery cannot really happen so long as malinvestments are not liquidated. Bailouts prevent the liquidation of malinvestments and the return of asset prices to appropriate levels; so long as this situation maintains, a recovery seems unlikely. I agree with this notion from a philosophical perspective, although from a financial perspective, it does not seem to be particularly meaningful. We can have a rally in the stock market and a plagued economy; the two are not mutually exclusive.
Personally I focus on trading the US dollar, though my bias is to short the S&P as it approaches strong resistance levels.