The "official" twitter client release of the previously named "Tweetie 2" is out, and Twitter for iPhone. The icon change is a bit strange to me (it's now blue instead of silver), but other than that it's mostly the same. Some cool stuff for when you're not logged in, and the search screen is a bunch nicer, but other than that it's mostly the same old Tweetie (which isn't a bad thing, as that's my 99% go-to app for twitter on the iPhone). Review and screenshots in the linked article.
Tweetie has been one of my favorite Twitter clients for some time now. Even better now that it's free. This first version under the Twitter brand doesn't offer that much different from the original. It will be interesting to see if Twitter truly adds value to an already very good client. I hope so.