It's worth what Twitter'll pay for it. They didn't go for $30m so it's clearly worth more than that...
TweetDeck, the discerning Twit's desktop client, is in discussions with Twitter about selling itself to the micro-blogging service for $50m, which could be small change to prevent the client turning into a competitor. The Wall Street Journal reckons the companies are "in advanced talks" about Twitter acquiring TweetDeck and …
What is awaiting approval from Apple is a completely re-designed version of TweetDeck for these platforms, not a first version, so there already is an approved version in the AppStore downloadable today and has been for a very long time now.
1st mistake: just the Windows desktop version runs on "Air" ... obviously ;) ... while as you can imagine the Chrome app. version does not (how could it...)
2d mistake: as mentioned by another user here, there's already an iOS version, while a new one is coming out in a few days now
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