One of the top features of the Apple iPhone and iPod Touch is that their app store is supposedly 100% safe. This has been proven to be false. An iDevice hacker (and developer), Charlie Miller, has recently found a bug which allows the app to place unsigned code in the memory, and then run it. This is a simple workaround to apples main line of defense. Any app needs a required signature from Apple in order to run. Basically, this exploit could be used to install malicious software, without ANYBODY ever knowing about it.