The voice comments archive page can be found right here.

If you’d like to leave a question for an upcoming guest, or have something to say about the site, go ahead and record it and send it my way with the plugin below. Voice comments will go straight to me and won’t be available to the public unless I include them in one of my podcasts or on the voice comments archive page. In order for plugin to run, flash will need to be installed on your browser.