1. P2 WordPress Theme:

P2 is a theme for WordPress that transforms a mild-mannered blog into a super-blog with features like inline comments on the homepage, a posting form right on the homepage, inline editing of posts and comments, real-time updates so new posts and comments come in without reloading.

You can get p2 WordPress theme form here

2. TweetPress:

Twitter Style WordPress Theme.

You can get this excellent theme from here

3. Fresh Tweet WordPress Theme:

Twitter WordPress

You can get Fresh Tweet theme form here

4. Twitter Journalist WordPress:

You can get Twitter Journalist WordPress theme from here