I love, love, LOVE CoComment! The idea is a good one: bring together your widely scattered blog comments and help you track the replies from around the...err...commentosphere. But not only is the idea good - the execution is excellent. Nary a day after entering my email address on the homepage, an invite dropped into my inbox and I was ready to rock. I was up and running pretty much instantly. It's totally intuitive : just drag the bookmarklet into your browser and hit it just before you submit a comment. You can then display your comments on your blog and subscribe to the RSS feed to be notified of replies. Simple, yes, but incredibly useful too. From the site:
coComment is a service to simplify of one of the most painful and ineffective processes on the Web: blog commenting. coComment is free, and will help you keep track of the comments and conversations you and others are making on blogs. Did you ever lose track of a conversation because you lost the URL of the post you've commented on? Have you ever wished to be informed when someone responds to your comment, rather than frantically refreshing the page looking for a reaction to your latest comment? How much would it improve your life if you could see all our conversations in one easy and simple page? coComment will address these issues by giving you an easy and seamless way to track and follow your online comments and conversations.