Sounds like Fav.or.it is going to solve the issue of bringing my comments back to my blog, better than Co-comment does (which seems borked at the moment?). From Mike Butcher at Techcrunch UK:
Fav.or.it is tapping into some powerful ideas floating around right now. ReadWriteWeb reckons the conversation has left the blogosphere and leading entrepreneurs like Loic Le Meur want the conversations back on his blog, which he owns, not DIgg/Twitter/ etc. FriendFeed is trying to do this, but it’s basically just another platform owned by someone else, not your blog.
Conversation Tracker will show what posts you have commented upon before and now have replies that you may want to respond to. To date, fav.or.it is still the only service out there that sends comments back to the source of the original content.