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You don't have to share your SSN or other private information; they'll even alert you of suspicious transactions on your credit card, alert you when you're nearing your budgeted spending in a specific category. There are over one million users, and the site has received multiple awards... I could go on, but you'll have to see for yourself!
So.. why is it free? Because mint.com takes a snapshot of your finances and recommends {enter: advertisements} the 'best' products for you. For example, your current savings account may only earn .03% APY and mint.com might recommend an interest-bearing savings that can earn you 3% APY. Of course, to view these offers, you have to click on them - you can always ignore them if you're happy with whatever system you have going. :)
Hopefully you'll find mint.com to be as handy as we have!