I’ve been doing a lot of commenting on other people’s blogs lately, and using co.mments to track the conversations. It’s easy, just setup an account, install the bookmarklet in your browser, then when you’re on a page where you want to track the changes, just click on the bookmarklet and co.mments will pop up to tell you that it is tracking the conversation. Works even if the blog doesn’t have a comments feed, and also works even if you forget until after you’ve posted your comment (which was a problem with CoComment). In fact, you can go back to the post at any time and invoke co.mments. You can, of course, get the results as an RSS feed too.