My initial thoughts are very, very positive; I now know why so many of you were so vocal about your Tweetie love. No sooner did I crown Tweetsville the current champion in the Twitter for iPhone Battle Royale, Tweetie shows up with some serious moves. At this point, I don't even know if I can adequately name a "champion."
Another Twitter client?
As I've said before, Twitter and the iPhone are a perfect combination -- they just go together. That said, Dave makes a solid point: the number of available Twitter clients for the iPhone is getting a tad ridiculous. I have tried almost every Twitter application available for the iPhone/iPod touch (see below) and they can tend to blur together.
And these are just the apps I've purchased or downloaded for free
This is where Tweetie really stands out. On the features front, it is pretty similar to what Twitterlator Pro, Tweestville and Twitterfon offer, but its interface is extremely clean and unobscured. In fact, it took me a little while to figure out where some of the more advanced settings for the app are. They are actually in the main "Settings" panel, rather than inline the app itself. That makes sense, and is apparently something Apple recommends, but it's worth noting because otherwise you might miss where some of the features actually are.