Great post Fred. What I would like to see is whenever I comment on a post, anywhere on the web, it shows up on my own blog automatically. So people who find my blog can see wherever else i've commented -- and of course will link back to the conversation. And it would be great if you could tell Yahoo! or Google search who you are -- so anytime your name is googled they come back with your blog your comments, etc.
Providing your comments on your feed is a nice start, and I haven't seen the recent RSS reader stats (or web pages that publish from RSS feeds, like BuzzTracker.com), but it won't really solve the problem until there is much wider adoption of your feed as the mechanism by which people find and consume your content. I know in youru case, given your readership it may be quite high -- but for the rest of the world I doubt it..