If you are looking for a banner exchange program that only displays banners from family friendly web sites, consider the banner exchange program at ThatsMySite.com. Only PG-rated web sites are accepted into this free web exchange program that offers a 3:2 exchange rate.
NEObanners provides a free banner exchange service that automatically trades banner ad space on your web site with banners from other web sites. Its fully automated system displays graphical statistics for you to monitor your web site's activity and keep track of your banner display credits.
The LinkBuddies Free Banner Exchange has a unique sliding exchange ratio that allows you to receive up to a 1:1 exchange ratio. You will receive 500 credits when you set up your first banner exchange account with LinkBuddies. You can also create your own banner exchange.