Hey there,

I know it's not really where you were going with this post, but on the subject of keeping track of the comments YOU make, CoComment (http://www.cocomment.com/) has tools for tracking comments you make around the web - which you can then get a feed from, to put into FriendFeed (or aggregator of choice).

I used their blog tools for a while, but switched back to a vanilla Wordpress install for my own reasons, but their stand alone commenter tools are also quite good too.