The Animal Rescue site is once again having its shelter challenge where visitors to the site vote for a shelter after clicking on a button to donate food to animals - no cost to you, sponsors donate the food. Shelter winners can win up to $100,000. If you don't know a shelter to vote for, I'm voting for Good Mews no-kill cat sanctuary in Georgia. I got my two dear ones, Heather and Shannon, there, and was very impressed with the shelter.
There are related sites for Hunger, Breast Cancer, Child Health, Literacy, and the Rainforest. You can get a reminder email from any of them to click, and once you're on any of the sites there are tabs at the top to take you to the other sites. It doesn't take much time to click once for each and donate to those causes.
A store is associated with the sites, and by buying from it you donate more to those causes. It's a great place for Christmas gifts, because you can find unique gifts at a good price there.