Should schools offer students incentives for academic performance?

A school district in central Ohio is trying a new kind of incentive pay -- for students. In return for doing well on annual exams, each student can earn up to $100. And in schools near Miami, students can win pizza parties, tickets to the prom, and even iPods in exchange for passing scores on their new state science exam. Proponents of these kinds of incentives maintain that this is one way among many to encourage academic achievement, particularly when many schools' livelihoods depend on test scores. Others argue that these are bribes, and don't encourage meaningful learning. What do you think?