TweetPress, gives you all the tools you need to integrate your wordpress and twitter, including "Login with Twitter" and "Comment via Twitter"...
highly customizable and easy to use.
Key Features
- Allow your visitors to comment using their twitter ids
- Adds a tweet button to your posts, so your visitors can share your content.
- Allow your blog users to sign in with their twitter ids. one click signin!
- Automatically publish new posts to a twitter account.
- Easily customizable by theme authors.
- Add a follow button to your blog