How low mortgage rates can work for you - MONEY Magazine -- Just when it looked as if mortgage rates couldn't fall any further, they did.

Rates on 30-year fixed-rate mortgages (excluding jumbos) hit an average of 4.3% in September, the lowest level since 1953, according to Freddie Mac, and are still hovering below 4.5%. Fifteen-year rates are even more mouthwatering: 3.8%. Mind you, those are averages. The most creditworthy borrowers can do even better, snagging rates perhaps a quarter of a percentage point lower.

So what's in this for you? A lot, potentially. If you have a credit score of 720 or higher and at least 20% equity in your home, you might use these crazy-low rates to shorten your mortgage term, free up cash, or even add to your real estate holdings.