VolunteerMatch
Thousands of volunteer opportunities online, sorted by category - including virtual volunteering where you can work from home. Free to both organizations and volunteers. http://www.volunteermatch.org/
Bénévoles Canada
Représentant national de l'action bénévole. Fait la promotion du bénévolat et de la participation civile par le biais de programmes permanents et de projets spéciaux. http://www.volunteer.ca/
Global Volunteer Network
Connecting people with developing communities in need. Information about volunteer opportunities with partner organizations in China, Ecuador, Ghana, Nepal and Romania. Based in New Zealand. http://www.volunteer.org.nz/
American Red Cross
This organization will share your HLA information with the U.S. National Marrow Donor Program if you wish to be considered as a donor. http://www.redcross.org/