Small gestures can have a big impact on the world and on your day.
The Rainforest Site, which gives you a chance to help preserve rainforest acreage just by clicking a button. The site is part of the GreaterGood Network, and every time you click the button, GreaterGood.org makes a donation to rainforest preservation. Don't abuse the button though: Only click it once a day. However, if one click is not enough for you, visit the tabs at the top of The Rainforest Site to have GreaterGood donate to causes like animal rescue, literacy, hunger, child health, and breast cancer.
After making these little acts part of my Web routine, I have found that they give me a moment of peace and satisfaction in an otherwise hectic schedule. It feels nice to do something to make a difference--even if it's a small difference.