A feature that quite a few teachers requested recently is VGA output, so that they can display the graphs on a projector or TV. Actually, many people asked for this over a year ago as well, but there was no public API available in the iOS SDK. With the introduction of the iPad, Apple enabled developers to make this happen, and I will be supporting it in the next release. It will be available in both the iPhone and the iPad version of the calculator, and you'll be able to use any of the video cables (component, VGA, or RCA). The 2G and 3G iPhones will not support it because of performance issues, so you'll need at least an iPhone 3GS.