While TV Guide has not officially released an iPhone web app or a native app store app yet, there is a mobile version of the TV Guide website which renders in a somewhat usable way when viewed from the Safari browser on your iPhone or iPod touch. This mobile version at m.tvguide.com lists Breaking News, What’s On, TV Listings, My Channels, My Shows, My TV Blogs, Search, and Preferences.

Note: Some of the features require you to register with the TV Guide mobile website from your iPhone.

You must be using an iPhone to see the iPhone version of this app. Try it here