I like the idea of co-comment and integrating to work with any comment system, but ti seems to fail often.
Disqus and Intense Debate are cool, but I don't really want to have to switch over my blogs and other systems to just get comment tracking. I don't care as much about the karma of comments I guess.
So I would perhaps focus on that, because as a blogger and someone writting an app, I am unlikely to change the code of my systems to support your avatars, I would be happy if the comment tracking worked by default. Then I might point out the service to readers on my blog or make a link by the comments like "track these comments with subavatar"
On your page I would show example screen shots of the avatars and comment tracking in action on some site. I couldn't get a very good feel of what the avatars were like. Perhaps have a link to your own avatar to let people see what the whole profiles look like.
Good luck
My profile http://subavatar.com/user/6e00c923a13ce323523d417e40c1537e
The initial release had an elaborate system generated avatar system (Identicon), but found them very cold, inhuman and controversial (some of them looked like swastikas). I've converted them to a simple color coded placeholder now.
PS all avatars are linked to their profiles.