Jonas has a Technorati Cosmos plugin which is kinda neat. I think it may have the wrong approach though, here’s how a really nice Technorati plugin would work: watch the site cosmos feed for incoming links, if the link isn’t to the root use the same code we use for Pingbacks to determine what post it’s linking to, if one at all, then check if the incoming link already exists as a Trackback or Pingback, and if not insert it into the comment table chronologically in line with the rest of the comments. (And send a notification email.) Cosmos should work transparant of other forms of commenting. Bonus points if it works with referrer data too, call it “remote-comments.”