I came across this website that tracks all of the comments you made. The nice thing about WordPress is that it will track your comments and interactions with other WordPress blogs but that’s it. If you posted a comment at a blog that uses blogger or some other service you may want to follow up on it but don’t remember which blog it was at.
Well Backtype will do that for you
It does not list all of the interaction but it will list all of the comments you have made including your own blog. Also if you are wondering what your favorite blogger is up to you can type their name in and read all of their comments as well.