I'm missing the CrunchGear 1st Birthday Party at Red Sky tonight (went to the Web 2.0 Meetup, and that was enough for this non-party boy), but I admire the way their posts allow an RSS feed for one post, so you can track comments as they're added to the post -- "you can follow comments to this entry through the RSS 2.0 feed" ( one sample). The best of journalism, community and finely honed or tuned interest. And it's got to drive ad inventory, both volume in aggregate, and targeted in reach. The kind of editorial and commercial win-win that's perfect.
Reminds me of the feeds Marketwatch had (or do they still have them them? their RSS page doesn't show it) for individual topics that the user could set via search terms.