This plugin collects the comments you posted on other people's websites and lets you display them on your own blog.
The standard WordPress trackback link behavior does not provide users their expected result. wp-TrackbackPopup resolves this issue. It uses unobtrusi
Displays Twitter users that recently Retweeted your articles
Notify a user about when he sent comment or form via Contact Form 7
Displays Google Buzz button and Google Buzz Comments