I found this organization (well, technically, they found me through Twitter) which not only is helping out in something that I think many women have to deal with in a very intimate way, but also doing it very innovatively.
Its goal is to raise $1 million dollars towards breast cancer research. The way that you can help is easy: want to search for something in Google? Instead of using Google's interface, use theirs. That's it. The results are going to be given by Google, so you won't lose any information, and you'll be helping out in the process.
It is very interesting how the Internet is being used nowadays, and I feel very proud of these people for coming up for a solution that not only is probably going to be very effective, but that it also is very easy for the user. I guess that Google is a big factor in this, so kudos to them too.
... I promised that it was going to be a short one this time, didn't I? Mmm... Ok, ok. Bye.
EDIT: (2008-08-12) I've taken down the Pink Ribbon Search logo because it apparently isn't in service anymore. If it comes back up, I'll reload the logo.