What's the evidence for statins?

"Many studies show that statins can help prevent heart attacks in people with coronary artery disease. Most people get unstable angina because of this disease. Studies also show they can lower the risk of stroke. However, not many studies have looked specifically at taking statins soon after an attack of unstable angina. We found one study with more than 3,000 people who were in hospital because of a mild heart attack or unstable angina. Some started taking a statin and others took a dummy treatment (a placebo). After 16 weeks, those who were taking the statin were less likely to have made another emergency trip to hospital for a similar heart problem" - Guardian/BMJ