I have had a plugin running on my photoblog In Photos for quite a while now that imports comments on my Flickr stream into my blog posts. It prefixed “Flickr:” to the username and linked back to the Flickr comment.
Due to overwhelming demand (two people asked!), I cleaned up the plugin a bit and put a configuration page on it and called it the Flickr Comment Importer. There are a few things to consider if you want to use this plugin but it’s straight forward to install and configure and it’s all documented on the plugin page.