In case you haven't heard the news, National Volunteer Week in 2008 is coming up on April 27-May 3.
Every single person I know who volunteers ends up having a fantastic time and wants to do it again. Most people are just amazed at how little they can do that means so much to so many people.
Check out Volunteer Match for things you can do in your local area, and they even have some online ways that you can help. Participate. It will do you and the world some good.