Here is the changlog of Twitter Theme(AT4US),you can find the theme files here:
http://code.google.com/p/dupola/downloads/list?q=label:TwitterTheme

* Twitter Theme 2.8
Add custom default Gravatar image file,you can set it in "yourdomain.com/wp-admin/options-discussion.php"
Add Post Time below post title,I use "acronym" tag.

Fix some little bugs.

* Twitter Theme 2.7.3
http://dupola.googlecode.com/files/at4us2.7.3.zip