As you know, I've been working on KG-Chart Mobile, and here is a screen shot.
It will work on iPhone/iPad/iPod on iOS 5 or later.
There are still many functionality I have to implement (I think it's about 50% done), but I think it's going to be great one.
Developing on iOS/Objective-C is kind of fun, I found, and I'm enjoying learning new technology.
Updated: iOS version requirement changed from 4.3 to 5. Due to a framework necessity provided by Apple, it will need iOS 5.