VolunteerMatch is a leader in the nonprofit world dedicated to helping everyone find a great place to volunteer. The organization offers a variety of online services to support a community of nonprofit, volunteer and business leaders committed to civic engagement. Their service welcomes millions of visitors a year and has become the preferred internet recruiting tool for more than 30,000 nonprofit organizations.
You can post your volunteer needs, find a place to volunteer in many different interest areas, including hurricane relief, arts, animal rescue, etc.. There are also virtual volunteering opportunities, which let you volunteer without being physically present.