After some delays , the new TweetDeck for iPhone app (known as iOSDeck) arrived in the App Store this morning. And not a moment too soon, as the old app was badly broken and TweetDeck effectively abandoned it months ago in favor of rebuilding it from the ground up. I've had some time to play with it today and here are my impressions: The Good: Combined columns: This is the greatest new thing ever in Twitter apps. While this was a feature already included in the Chrome version of TweetDeck (known as ChromeDeck ), its making its first appearance here in the iPhone app. Basically, instead of having a Twitter feed, a Facebook feed, a DM feed, etc., you can merge columns, so you can put your FB and Twitter feed into the same column; all your replies, Facebook mentions, etc., go into another column, and so on. You can combine multiple searches into one column. The flexibility to create your own columns substantially cuts down on the number of columns I have running. A gigantic thum...