I've been hosting comments here for the past few months, largely at the urging and encouragement of Denham Gray. While I don't get tons of comments, the ones that I do get are generally very high quality.
As you might suspect, given my enthusiastic support for RSS as a tool to make my life as a knowledge worker easier, there is an RSS feed for my comments. I host it at a “Manila” site, provided by the great folks at Weblogger, which is a site I'm holding for a future development project. Anyway, please feel free to subscribe to that comments feed in addition to my regular RSS feed.