After I read a review by Michael Arrington (see the original review and the update), I have decided to try coComment.
With CoComment, you enter your comments throughout the blogosphere as usual, with one exception: just before you submit your comment, you click on the coComment bookmarklet. This sends a copy of your comment to your coComment account. You can then keep track in a central location of all your comments and, more importantly, you can view subsequent comments from others in the same conversations.
In addition, if youhave a blog, coComment offers you the option of adding a widget that shows recent comments.
Unfortunately, coComment does not (yet?) support trackbacks.
