Yes, the title of this blog says what it says. You can track your comments with Backtype. When you sign up, you enter your information with websites you use when filling out forms and social services you use that you comment (like Twitter, MySpace, FaceBook, MyBlogLog, and more.) Once you have set this up, the site will post the comments you have made at sites using the URLs that you included.

As an example, you an view my Backtype profile to see the comments and what it is about.

I think that service is pretty cool.
sometimes i forget where are the place i have commented on
so this is might be so useful for me