I show my compassion with my money. In 2007, I read a Yahoo! news story about how people would walk hours from Burma to receive treatment at a border clinic in Thailand. The Mae Tao Clinic -- as this clinic is known -- is usually the only option these Burmese have for healthcare. I was moved by that, and since I could not go to Thailand to volunteer, I sent them a check the following month. I still support them today.
Same with how I heard of Heifer International's gifts of livestock to struggling families in order to provide those families with income, and how the recipients are required to pass along the offspring of those animals to other struggling families so that a single gift of an animal ends up supporting more than one family. I began supporting Heifer in 2006, and if any of you watch "Oprah" (I don't), Heifer was featured last year when she did a special about a remarkable woman named Tererai Trent, who was previously illiterate, married off in her early teens, and herded cattle. She is getting -- or has probably got -- her PhD from Western Michigan University, and Heifer was a big part in making that happen. I still support them today.
That's how I've shown compassion.