Twitter Comments for Your Website
Chirrup is a really simple Twitter comments solution. If you're familiar with the FriendFeed plugin for WordPress, Chirrup won't be a problem at all. It's essentially a separate component to add to your blog, similar to a widget. The system "Chirrup fetches all of the replies from Twitter, and sorts them by URL so you can have a comment feed for each page in your site." You can place the comment box anywhere you'd like and style it to your tastes. Users can even send a Twitter comment through system.