Question : How can I create a signature capture in iPhone SDK?

I have a requirement from a client where I need to capture the end users signature.  They will be signing with their finger.

Answer : How can I create a signature capture in iPhone SDK?

On WWDC people talked about a serious improvements in the gesture recognition on iPhone 4.
You can find a code (current SDK) here:
http://www.iphonedevsdk.com/forum/iphone-sdk-development/6711-gesture-recognition.html