The application formally known as Tweetie has been removed from the App Store to make room for the official Twitter branded iPhone app. This app—which is basically Tweetie with a name change to make it official—is now available in the App Store both internationally and in the U.S. It’s labeled as version 3.0 (up from 2.x) which means that along with the re-branding, there are some new features.

Macworld 2010 is upon us, where numerous developers will be showing off the iPhone apps they’ve released and previewing what’s ahead. Appletell will be there to find the gems, but what about all the apps that won’t be there? There are a lot of great apps in the app store, but that doesn’t meant there couldn’t be even more. What kind, you may ask? Well how about…

When I previewed the Tweetdeck beta for OS X, I called it the Photoshop of Twitter clients; an extremely powerful tool for people who needed to filter a lot of information on Twitter. At the time, it was a lot more power than I needed, but as I use Twitter more and more, searching posts and users, I’ve come to rely on it as my primary client. Now there’s a Tweetdeck client for iPhone that provides a lot of the same tools, as well as synching information between the two.

Twitter can be a great way to follow what friends and celebrities are thinking; to get snapshots on the thoughts of people around the world. But two Twitter apps, JustUpdate and Gyazickr, break away from the rat-race of adding features to Twitter, and instead go the opposite direction: stripping away features and focusing solely on updating your own feed. Both applications are free.

Twitter, the micro-blogging site where you can upload posts of just 140 characters, is designed for the mobile. In fact, it’s built around the SMS, with the idea that people could answer the question “What are you doing?” from any cell phone or web connection. Twitterrific from the Iconfactory gives access to most of the popular features in a simple, easy-to-understand interface. It comes in two versions, plain (free) and premium, which are identical, except that once per hour the free version displays a small ad.