How long do I have to renew my passport?

I want to confirm what I read. My passport will expire on March 27, 2011. I have no urgent need to renew it at this time. I read that I actually have

Source: http://www.us-passport-service-guide.com/how-long-do-i-have-to-renew-my-passport.html

government passports united states passports online passports