Mint is a free online financial management service designed to compete with local money management software and other online finance services. It will interface directly with your bank and credit card companies (there are more than 3,500 institutions on the system) to keep your accounts up to date.
You can also configure the product to send you e-mail or mobile alerts when certain conditions are met, such as accounts dropping to certain levels, bills coming due, or when large purchases are made on credit cards you're tracking. It also has an application for mobile devices that lets users keep an eye on things while away from a computer.
Mint makes money for itself, and for you, by looking at your spending habits and your accounts and recommending offers that will save you money. Got a high-interest credit card? Spending too much on DSL? Mint's advertising network will match offers from its partners to your particular situation. Mint's consumer pitch is that it will save you thousands of dollars a year if you listen to its paid advice.