Thanks much. It turns out everything was working correctly, though I did stumble across the following which may have been an initial issue.
http://wiki.evident.nl/(X(1)S(qsqp3dfouruz4gfanpw12gji))/Anonymous%20blog%20comments.ashx?Code=1
"When working with templates based on the Kentico Portal engine, anonymous comments will not work after checking the "Allow anonymous comments" field. To get it work, you also have to uncheck the "Check permissions" field in the configuration of the "Comment View" webpart."