twhirl 0.7.5, the Twitter client has been released. According to a post at twhirl blog it was released to fix a problem that a slight modification in Twitter’s API caused twhirl to no longer show avatars and usernames.
In addition to this, a brand new service: tweetburner is supported to provide short urls to post on twitter. Unlike other tinyurl services, tweetburner could track statistics about how often links are clicked, and much more.
More about the release and other information could be found here.