How Does Making Your Mortgage Payment Bi-weekly Save You Money?

I got a letter in the mail from the bank that says paying our mortgage payment bi-weekly instead of monthly could save us $40,000 to $100,000 in interest and reduce our mortgage term by 7 to 9 years without refinancing. How does this work?

How Does A Mortgage Holder Get Out Of Pmi Payments On Their Mortgage Loan?

Seems to me that PMI is very costly for the home owner, especially me with a perfect credit rating and new funding source to maintain a mortgage if I lose my job (my job is very secure). Please any suggestions on how to get the PMI waived by the mortgage company.