Quick Idea: Make smaller mortgage payments every other week, shortening a 30-year mortgage to only 24 years.

How it works: If your mortgage payment is $1500/mo, instead pay $750 every other week.  At the end of the year, you will have paid 1 full extra mortgage payment.  You will also have “prepaid” every month directly toward the principal, which will save a bundle in the amount of interest you pay over the life of the mortgage.  Calculate exactly how much you’ll save by paying bi-weekly.

What to do: Spring the task list!
1. Be sure you can afford it – I recommend always having one full month’s mortgage payment in your checking account to cover the 2 months when you will make 3 (half) payments.
Spring a household budget planner!
2. Contact your mortgage company to find out if they offer a bi-weekly payment.  Most either offer it themselves or contract with a service.
3. Set up automatic payments for every other week or create a repeating reminder for yourself to write the checks.
Spring a bi-weekly alarm!

Resources
Mortgage Calculators Plus Why Does A Bi-Weekly Program Help You?
Wisebread DIY Mortgage Acceleration
My Money Blog Biweekly Mortgage Payment Plan: BiSaver vs. DIY
About.com Save Tens of Thousands of Dollars But Avoid the Scams
The Simple Dollar Extra Mortgage Payments Versus Investments: Which Is The Right Move?