CommunityService.org ... inform, encourage, inspire!

There are several websites that allow non-profit organizations to post volunteering opportunities. Unfortunately, most tend to have a US focus. Here is a short list:

1- http://www.VolunteerMatch.org
2- http://www.Idealist.org

(please let us know if you know of other sites, either national or international, that you have found useful to post opportunities and attract volunteers)