I've had the privilege to be testing Twitterrific 5.6 for iOS for the past few weeks, and it is a fantastic update. This big feature with this release is support for Twitter's streaming API.
Once you've enabled streaming in the app's settings, tweets will come in as they are posted in real-time while you are on Wi-Fi. Twitterrific will intelligently switch back to manual refresh when you drop to a cellular connection.
Streaming is one of those features that has been a long time coming for Twitterific. Streaming makes the Twitterrific experience that much more frictionless and delightful. In my opinion, the lack of streaming was pretty much the final piece of friction left in Twitterrific, and now it really feels feature complete.
Another great feature, though one I admit I have not used often, is list management. For the extremely organized among us, this is a great addition.
You will love Twitterrific 5.6, which is available as a free update to existing users, and available to new folks for
$2.99 99¢ on the App Store.
Update: Changed pricing to reflect limited time 99¢ sale.