The Tax Policy Center has graded the key tax provisions of the Conference stimulus bill:

Our grades reflect how well these measures would boost the economy in the short run per dollar of budget cost (sometimes called “bang for the buck”). For grading purposes, we assume that each provision will expire as scheduled and consider only the effects on aggregate demand (consumption or investment) or employment in the short-term. Each grade depends on both timeliness and targeting. To receive an A, a provision would have to begin quickly and go primarily to people who would most likely spend it or to businesses that would most likely use funds to retain workers or expand. We do not consider the long-term effects on the economy. An attached write-up describes current law, the proposed change, and the short- and long-term effects on the budget, the economy, fairness, and tax complexity. There, we also discuss the likelihood that each proposal would actually expire as scheduled and, for some provisions, explain what changes would raise the grade to an A.