Many people will know about this already but I thought it was worth mentioning again: there is a range of websites which ask people to click on them once a day in order to generate a donation to a particular cause. The donation is made possible by companies advertising on the site. They are:
www.thehungersite.com www.thebreastcancersite.com www.thechildhealthsite.com www.theliteracysite.com/
www.therainforestsite.com/ www.theanimalrescuesite.com