XML feeds for comments
If you use this feature, you can run an aggregator like Radio, FeedReader, AmphetaDesk etc and get a popup (or a note in the middle of your news feed) when someone adds a comment to one of your posts.
The Python Community Server will have a comments system like this one day. For the moment, we have the next best thing:
XML feeds for comment threads
At the bottom of every comment page (here's an example) there will be a white-on-orange XML icon, just like on the front page of all Radio weblogs, which links to an RSS feed for that particular comment page. It's not the same as what YACCS does, because that doesn't fit in well with the way the comment system works just yet.
There's also a tiny coffee mug, shamelessly stolen from Jon Udell's channelroll widget. Clicking on that will bring you to the news aggregator page in your local instance of Radio or Peerkat, if it's running, with the RSS URL automatically filled in.