Ann Calahan, 53
On a crusade since: 2004
Day job: President, Joe's House
Achievement: Creating a website that provides info on thousands of discounted lodgings near medical centers.
Why she's a hero: When Calahan's husband, Joe, had to travel to Texas for cancer treatment in the 1990s, the New York travel industry veteran faced an extra task: finding affordable lodging near the hospital. Seven years after Joe's death, memories of that chore led her to launch JoesHouse.org. The site offers 1,900 options for patients and their families, from discounted hotel rooms to free apartments.
Quote: "The whole idea is, you have enough to worry about. Let us help you find a place to stay."
When lives were disrupted by flood or fire, these MONEY heroes jumped in to help rescue their neighbors' finances.