Additionally, you might check out
Chapel Hill Rent, http://www.chapelhillrent.com - seems to be a solid listing site for rentals.
Also, I think that a few rental groups are
Millhouse Properties, http://www.millhouseproperties.com
Louise Beck, http://www.lbprentinfo.com
Redstone Properties, http://www.redstonepropertiesnc.com
If you are looking for a rental I can put you in contact with a company that may have an opportunity for you.