I have some suggestions for all you guys. I recently found this website its:
www.thehungersite.com
When you go on there is a thing in the middle that says: click here for free to donate food, and for every click they get they donate x amount of food to feed the hungry! It's free and takes a second. You can click on it every day!
Another easy one but maybe not so much for us, is to smile at everyone you see during the day. It is also free and can make someone feel better, but i know this might be a hard one for most of us to do, me included but maybe if we practice in front of the mirror and make sure we don't look wierd first until we feel comfortable then do it!
Or like Remus had said, we can try to help other's on this site by encouraging them or even when we come across someone we don't like instead of attacking them we could offer a kind word to them instead and try to understand where they are coming from? Or if you can't do that then the random act of kindness could be just not responding back something ugly to them, you know the saying,"If you can't say anything nice then don't say anything at all."