I didn’t like coComment; co.mments [via] is simpler and more functional. The purpose is less revolutionary: it isn’t so much about managing in one place all the comments you posted elsewhere as it’s about maintaining a list of threads you want to keep an eye on — whether you participated or not.
All you have to do is set the bookmarklet up in your links bar, click it, and (after a bit of Ajax magic, that always looks good) the post is added to your watched list… without even having to registering on the co.mments site, as you can be recognized by a cookie (even the RSS feed works without having to register).
That’s all nice, but not new; what matters is, co.mments manages to auto-detect comments on #FF00AA and my personal blog, both of which use home-made non-standard CMSes; it has a problem with accents, but correctly identifies each comment. A tiny modification to the gayattitude scripts, and all comments there are now taken into account to: I simply had to add an <a name> for each comment, which makes sense, and every blog should have those. And, even in the case where it doesn’t manage to identify comments on a particular blog, at least the post is in your list.
It’s pretty, simple, clean, and it works today, not ten years from now when all blog platforms have been reprogrammed to accomodate it. Heavily recommended to anyone who hasn’t formed the habit yet to bookmark any article they post a comment on.