Hi Matt,
Well I quickly ran it through Xenu (don't have the paid version of screaming frog) and one thing that sticks out immediately is your training registration pages like http://www.cbmtraining.co.za/register.aspx?c_id=1269 and http://www.cbmtraining.co.za/register.aspx?d_id=2249 for example.
There are quite a few of these pages and they all have the same title. You could put the actual name of the specific event in the title tag and that will help. It would also be good to put a bigger description of some sort in the page for each event, otherwise the registration form data looks pretty much like duplicate content even if you have a couple of lines unique for each event on each page now. You have a couple of other duplicate page titles floating around, but sorting out that issue with the registration pages will cut down the numbers a lot and let you focus more clearly on the others.
