Twitter for iPhone replaces Tweetie 2 on the iPhone
Tweetie 2 was launched as a separate application enabling users to stay with version 1 if they wanted to.
The product is now owned by Twitter who have just launched the third version which is now named Twitter for iPhone.
Strangely, this application has not been released as a separate app. If you install it, it would replace the Tweetie 2 app on your iPhone.
Twitter for iPhone is technically the version 3 of Tweetie. Though it now comes without a price tag.
Twitter has already launch similar official apps for Android and Blackberry platforms.
Twitter for iPhone would not replace Tweetie 1.x if you still have it on your iPhone.