A pyramid scheme chain letter that is not bogus

I received a letter with the following text

"It really does only take a minute.
A favor to ask, it only takes a minute....
* I * * *Y
Please tell ten friends to tell ten today! The Breast Cancer site is having trouble getting enough people to click on their site daily to meet their quota of donating at least one free mammogram a day to an underprivileged woman. It takes less than a minute to go to their site and click on 'donating a mammogram' for free (pink window in the middle).
This doesn't cost you a thing. Their corporate sponsors /advertisers use the number of daily visits to donate mammogram in exchange for advertising.
Here's the web site! Pass it along to people you know.
The Breast Cancer Site"
AGAIN, PLEASE TELL 10 FRIENDS TO TELL 10 TODAY "

Being the good skeptic that I am, I immediately suspected a hoax - a social virus - so off I went to check it. Turns out it is true - see The Breast Cancer Site - Click to Donate Free Mammograms - Netlore Archive

So, visit the site and tell your friends!