This is a great little site to satisfy the comment-lurkers in all of us. I will finally have the last word in every thread I post in! My power will be absolute! All kneel before me! (well, maybe just the ladies) 
har har
You post a comment on a blog. How do you know if anyone responded? You read an interesting post. How do you know when there are new comments?
Use co.mments to bookmark posts you want to follow. It tracks new comments for you, so you don’t miss out. You can see all the new comments from your tracking page, or subscribe to the feed.
Nice! This is like Flickr’s feature, where you can check on replies to comments you’ve posted via one tab, all listed on one page. It threads the conversations for you so you never have to wonder!