IBM just published an educational white paper by Pete Cacioppi on bi-objective optimization.
This white paper provides details for the interested business user as well as the researcher into the latest thinking in solving problems with more than one objective.
The paper discusses the business benefit of viewing the trade-off curve between two objectives and how this can give valuable insights into your problem.
It also explains some of the science behind this bi-objective optimization and how massively parallel cloud computing can effectively solve these problems.