I don't know if anyone has posted this before, but I came across this posted on MoneySavingExpert.com and it seemed too good not to share.
"There?s a website called TheHungerSite.com . In the centre of its front page there?s a button that says ?click here to give free food?. If you click it the sponsors of the site for that particular day pay for a cup of a staple foodstuff to be donated to someone who?s starving. The reason they pay is it is effectively a cheap form of feel-good advertising. It?s that simple; there?s no catch".