IT Pro has taken a look at the top ten mobile applications for Twitter, you can check it out over here. Here's one of them:
Tweetie is touted by many as the best Twitter app on the iPhone, though unlike Twitterific it’s not free; it costs $2.99 from the App store. Top of the feature list is its responsiveness, which is something you’ll soon get used to. Everything you’d expect to find is built-in, such as the timeline of messages and access to replies.
Interesting features include the built-in mini browser, so you can view links without loading Safari, auto compression of images before sending to TwitPic and a built-in search feature – great for finding out who’s been Tweeting about you or your company.