A new version of Twitterific, the popular Twitter iPhone application, is available in the iPhone app store.

Some new features include multiple account support, a filter for your mentions (formerly @username replies), direct messaging capabilities, favorites, and marks (your personal favorites). Other new features are more specific and custom than what you’ll find on Twitter’s website, including retweets, conversations, custom shortcuts, and shrinkable text. Complete Twitter bios and follow/unfollow/block capabilities have been added as well.

That’s a good amount of features added in a single update, and many of these features were already available on similar mobile apps, such as Tweetie. Looking at most of the features, you’ll note that they’re akin to what you’re likely to find on a Twitter desktop client such as TweetDeck or even Twitterrific’s own Mac desktop app. And the good thing about Twitterific 2.0 is that it’s moving more towards becoming a mobile application that supports all the necessary features we’ve grown accustomed to using web apps designed around Twitter.

Some of these key features include retweets, and the ability to glean all the pertinent information regarding a particular user without having to leave the mobile application. The conversations feature is also extremely important, as it threads updates together for relevant and fluid communication. This is useful no matter where or how you’re using Twitter. But for a mobile application where you’re less able to pull up separate browser tabs or windows in order to reference a tweet someone has responded to, the conversations feature for Twitterific 2.0 is adding a great deal of value to both its application and Twitter itself.

Want to check out more Twitter mobile apps? See here for a short list of the top mobile apps designed for Twitter users.