CoComments: Nice Idea, But Users Are Still Lazy
Techcrunch reviews CoComments, a product that lets you centralize the saving of comments you leave on different blogs, so you can view all your comments in one place.
It will be popular, but only with the alpha-geek set, because the onus in on the user to change their behavior to suit the software (indeed, even some geeks won't change their behavior).
End-users are lazy, and it requires the user to both want to experiement with changing their behavior, along with lots of positive reinforcement (i.e. helping the user kick ass) to modify behavior.
I'm still waiting for the CoComment one-up: a search engine that crawls and aggregates the comments a person has left on different blogs.
Letting the user be lazy and the software be smart won't guarantee success, but it will remove one more obstacle you're asking your potential customers to overcome to use your product.