October is Breast Cancer Awareness month. (Thanks to Crimeficreader for reminding us!)
Does everyone already know about the Breast Cancer site? You click the box daily to fund free mammograms. From there you can also link to the Rainforest site, the Hunger site, Child Health site, Literacy site ...
It takes seconds and costs nothing, so unless anyone can think of a good reason not to, why wouldn't everyone do this? I go to one site, click 'fund free ...', click back and then go through the links to the others.
What are you waiting for?