I’ve just bought a new iPhone Twitter app called TweetStack.
It has a great feature that my favorite Twitter app Tweetie doesn’t have, called “stacks” (groups). It works just like Groups in TweetDeck or Userlists in Seesmic Desktop. You can even import your groups from TweetDeck, and upload your stacks to TweetStacks servers.
You can organize the buttons in the toolbar so you can have fast and easy access to your stacks.
Your home stream or your stacks aren’t updated when you start the app. You have to click on the update icon (this could be Changed in the settings though).
I think that is a great feature because in that way you can pick up where you left, if you needed to read mail or send mail or something else on the phone.
All your stacks shows how many unread tweets there are, but you can mark all as read if you double tap on a tweet in the stack.
TweetStack crashes a lot and are a little buggy, but the developer says that next version will be out soon and fixes a lot of the bugs.
I think that I will use TweetStack instead of Tweetie for now because I will probably be more productive with it.
But I miss some features that Tweetie has, for example InstaPaper support and a bookmarklet to tweet links from iPhones web browser with.
Find more info about TweetStack here!
Update: The developer tweeted me that you can make a bookmarklet exactly in the same way you make it for Tweetie. Just Change the word "Tweetie" to "TweetStack" in the javascript.
Simple and great!
Some voices about TweetStack on Twitter (follow me here!):
maurilio: just loaded Tweetstack for the iPhone: tweetDeck like feautres. Great functionality, could use some more love on design.
1 minute ago from TweetDeck · Reply · View Tweet
StefanW: So far, I have already: updated iTunes and TweetDeck, downloadTweetStack at 2,39 EUR, learned how to make screenshots... :)
1 minute ago from web · Reply · View Tweet

pacificIT: @papadimitriou Yes. Multiple account support and so much more.Tweetstack is simply the best Twitter app for the iPhone.
29 minutes ago from TweetStack · Reply · View Tweet
AL_Laframboise: Tweetstack - a mobile Tweetdeck-like app. Kind of makes me want an iPhone... http://bit.ly/10BP
about 1 hour ago from TweetDeck · Reply · View Tweet
kawhalen: Trying out @TweetStack on iPhone. Pretty slick. But I don't like the bubbles.
about 1 hour ago from TweetStack · Reply · View Tweet
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Buzz it!