I'm a big user of Twitter, especially on the iPhone. Twitter and the iPhone are a perfect match of service and device. The Iconfactory's for iPhone has been approved by Apple and will likely be released on the App Store Friday. It will be a free upgrade for all existing users. New users can download a free version, which includes ads, or pay an introductory price of US$4 for the ad-free premium edition. I've been testing this version for a few weeks; here's a hands-on first look in video form. Don't miss as well.