Tweetie 2 has just been approved by the Apple suits, and should be on the way to the App Store within hours. Atebits on @Tweetie (on Twitter) just posted this tweet:
tweetieTweetie 2… APPROVED!!! (Might be a few hours before it shows up in the store).
and that’s how we know 
Tweetie 2 for iPhone means that there will soon be Tweetie 2 for Mac as well. The Tweetie 2 “update” will be £1.79 ($2.99) and is a complete rework of the original Tweetie app – including some amazing features which I’ve personally been gagging for in a Twitter app!