ONE/NW.org clients. Not all of these are mine, but I've had my hand on over 25 of these sites.

http://onenw.org/services/websites/client-list

Plone-based websites for UNC.

http://college.unc.edu
http://provost.unc.edu
http://history.unc.edu
http://southnow.org
http://comm.unc.edu
http://marine.unc.edu
Institute for Arts and Humanities (design only)
UNC sample template (design only)

HTML / e-commerce sites:
http://www.bettersex.com (no nudity, only product sales)
http://www.heavypetters.com (a petsitting site)
http://www.domicilenc.com (realty)