CoComment is a great idea, but I keep forgetting to use it. (You click a "bookmarklet" before submitting a comment and CoComment will record it for you.) I keep making comments on blogs and have no easy way to find them again.
Trackback was sort of meant to be useful here, but generally I want my comments to appear in the comments section, and don't wish to create a whole new journal entry just to comment.
There needs to be a better, yet still decentralised way that people can identify themselves, comment on blogs, keep track of comments made under that identity, and track responses to those comments. Further investigation required...
