"WordPress users on the go will be happy to hear that WordPress 2, a significant update to the WordPress app, is now available from the App Store."
This is a new app, so if you have the previous one you will have to download this one, rather than update. There are a couple good resource sites for iPhone users that also use WordPress. One is WordPress for iPhone Blog and the other is Making WordPress for iPhone Blog.
WordPress 2.0 for iPhone/iPod Touch
Linear Mode
