coComment I'm beta-testing the coComment web-service, which tracks and aggregates the comments you leave on blogs you visit.

coComment also alerts you (via an RSS feed, soon via email or SMS) when new comments are added to the conversation.

Note: while it is being beta-tested, the service is semi-closed and you need an invitation code to sign-up. I have a couple invitations, feel free to get in touch with me if you want to give it a try.

Update: sorry, no more invitations!