3M is donating $1 to City of Hope Breast Cancer Research for every person that registers their name and city on the website to support "The World's Largest Pink Ribbon" - a project that will involve a 70 foot tall ribbon made entirely of Pink Post-its (75,000 of them), which will hang over Times Square for the first week of Breast Cancer Awareness Month (October). It takes about 10 seconds and they do not ask for any contact info. If you get a chance to do it, it's a painless way to raise $$$$ for a great cause.
http://www.3m.com/us/office/postit/research/largest_pink_ribbon.jhtml
http://www.3m.com/us/office/postit/research/largest_pink_ribbon.jhtml