Be Nice To Me, I Just Gave Blood.

Last night I stopped by a local school and donated a pint of the red stuff. I've donated a few times before, and I'll be donating more in the future. It's probably one of the easiest and most genuine ways to do a good deed.
It usually takes about a half-hour from start to finish and when you're done, you get some time at the cookie and juice table. There's nothing like chipping in to save a few lives to make apple juice and oatmeal raisin cookies taste so good.
In case you were wondering, 60% of the population will need blood at some time in their lives, but less than 5% of the population donates on a regular basis. One pint of blood can be broken down into several components, which means that a single donation can save up to three lives.
As a secondary benefit, some studies show that if men give blood three times a year, they can reduce their blood's iron content and lower their own risk of heart attack by as much as 50%. So, yay for that too.
If you're in the New York/New Jersey area, you can find more info about blood drives (including drives in your area) at the New York Blood Center.
If you're not in New York or New Jersey, check out the American Red Cross at givelife.org.