There is significant traffic from the Knols directly and from the sites which syndicate your KNOL.
The 5 Knols I did last year had broght 1850+ visits altogether sending about 450-600 visitors to our site. There is indirect traffic from the syndicated content. Please see screen shot as below and a partial list of sites which syndicate the Knol.
http://www.handrailswise.com/Glass_Shelf/
http://www.bottlesdistrict.com/Plastic_Bottles/
http://containerlimited.com/Recycling+Containers/
http://www.canszip.com/Oil-Cans/
http://www.shelvingbright.com/Glass-Shelves/
http://www.bottlestoday.com/Plastic_Container/
http://www.glassfirm.com/Source.aspx?sourceid=21898
http://environment.kosmix.com/topic/Recycling
http://www.ontheknol.com/frontpage-knol/the-guide-to-recycling-part-1
http://www.finalbottles.com/