to link back to a product web page being promoted.
First an example from this blog.
In the comment box you can see that that there is a comment
I can delete the comment now that it is visible, but will leave it as an example.
I enabled the comment the gadget/widget for the recent comments by
a) Inserting the Feed gadget/widgetVoila, I can monitor comments easily.
b) Setting feed URL to http://myblog.blogspot.com/feeds/comments/default
c) Couple of other simple configuration
For a more complete step by step description to install recent comments/feed widget see