It's open enrollment period for many, and you may be among those considering switching health plans, whether to save on drugs costs, or simply because you're not happy with your coverage. If you're on Medicare Part D, you may have even more reasons to shop around, including rising premiums, the "doughnut hole," and changes in the drugs your plan will cover. Find out whether or not you should switch plans and check out our recommendations on dealing with the doughnut hole.