Installing a lightning protection system is not a do-it-yourself project, but it's very important in protecting your home from the massive damage lightning can cause. Systems vary, but they all consist of an air terminal on the roof that's connected by a copper or aluminum conductor to a 10-foot grounding rod driven into the ground. Have it installed and inspected by a certified specialist.
For more on home safety, consider:
The Power Outage Survival Guide
9 Ways to Boost Your Fire Preparedness
8 Home Hazards-And How to Mitigate Them