Released in November 2008, I bought it and was hooked. The clean UI, overall simplicity, and ease of use were great. Sadly, it lacked useful features like multiple attachments (eg, photos to TwitPic), and support for other services, like TwitVid. But it was still usable. The problem is that the developer pretty much dropped off the face of the earth for a few months.
Until last month, when Tweetie 2 was announced, which came out, literally, in the last hour or so.
Sweet new icon eh? Anyway, Tweetie 2. It’s awesome. It has support for 2394586345749356436 different services, including TwitVid (yay!), and, in one word, it rocks. It’s well worth the £1.79, and the whole app feels super smooth, the UI is still clean and still works well, and it’s amazingly good overall. If you have an iPhone and use Twitter, then get Tweetie 2. There’s a reason why it’s the winner of Apple’s 2009 Apple Design Award. 
And of course, you can get Tweetie 2 on the App Store.
