At the U of M, where I work, we have the option once a year of choosing among a list of charities, and dedicating a certain amount of money from each paycheck towards it. I give $5 from every paycheck to Open Your Heart to the Hungry and Homeless. Works out to about $130 per year. I've also donated cars in the past, and all my old eyeglasses when I got Lasik eye surgery.
When I was in the Peace Corps in Burkina Faso, I was amazed to see the t-shirts and coats that people would wear around the village--things that someone had obviously dumped in a box a some church in small-town Midwest America ended up clothing destitute people in West Africa. Some of them made me giggle--school sports team shirts and whatnot. There are so many people out there who need the stuff we so thoughtlessly cast aside.