Now instead of relying on individual bloggers to email-update enabled their blogs, co.mments will take care of the work for you — on any blog! Ever want to get follow-up notifications on responses to comments you’ve left on someone’s blog? Or just wanted to find out about new activity on a given blog post? Well, now you can. Via email.
Factory Joe 
It still does not help to monitor a whole blog, does it?
It is exciting that Cocommenting and Co.mmenting are pursuing the problems from different angles.