Meebo, developers of the popular web-based Instant Messaging application, have released a native IM app for iPhone and iPod touch users. Prior to the advent of the App Store, Meebo was one of the few iPhone optimized web applications for instant messaging on the first-generation iPhone. Released yesterday, the new Meebo app provides a native iPhone application with support for over 100 IM networks through the Meebo service. The Meebo app also includes…