Twitterrific is the latest application from Iconfactory, known for its slick design sense and computer-customization software. This free iPhone/iPod Touch app, which is also available in a paid premium version, is more of the same Iconfactory goodness, combining a shiny interface with a wealth of features. Worth noting is the app’s “Sources” menu, which lets you view the public timeline or your own, a list of recent Twitter trends and a trio of different search options. It might take you some time to get used to the app’s various menus and discover all of its terrific features, but once you do, it’s totally worth it. You can also get a desktop version of the software, but be prepared to shell out cash for it.