4laborsoflove.org
http://4laborsoflove.org
For volunteers to list their skills, and for agencies to list volunteer opportunities.

Action Without Borders
http://www.idealist.org
A place to post and find volunteer opportunities, including virtual volunteering opportunities, and for volunteers to post about themselves. Offers many other nonprofit resources as well.

Metro Volunteers!
http://www.metrovolunteers.org
Metro Volunteers connects individuals, families and groups with hundreds of local volunteer opportunities within the metro Denver community.

Network For Good
http://www.networkforgood.org

ServeNet
http://www.servenet.org or http://www.volunteernow.com
A place to post volunteer opportunities, or to post volunteer interests. Opportunities are tied to the challenges of America's Promise.

VolunteerMatch (& Impact Online)
http://www.volunteermatch.org
It's Web site is an excellent place for agencies to post volunteer opportunities (VolunteerMatch/CityMatch), including virtual volunteering opportunities. Potential volunteers can use the site to find volunteer opportunities .

Finding Technical Assistance Volunteers

Virtual Volunteering Project
http://www.serviceleader.org/vv/findta.html
A guide designed specifically to help agencies use the Internet to recruit volunteers for "specialized" volunteering -- web design, fund raising, graphic design, accounting, etc.