Many (most?) of you may be aware of this site, but just in case you are not...http://www.theanimalrescuesite.com/clickToGive/home.faces
This site has a spot to click on that by doing just that, simply clicking your mouse on it, will cause a donation of pet food to be donated to an animal shelter. There are no gimmicks or tricks, no money to spend, nothing else for you to do -- just click on the big purple "click here" button on the site and an amount of food worth .6 bowl of pet food will be donated.
If you are interested, visit the site and give it a try. You can click once a day, every day. I have added the site to my favorites list so I can remember to click every day. By scrolling down on the site, you can see how much food is donated each day.