Got an iPhone4....convince me I need an iPad

[DRJDVM's '69]

So I've had an iPhone 4 since they came out...love it and use alot of its features.

Thinking of getting an iPad2 for Xmas for my wife.....but to me it seems like the iPad is just a big version of my phone (except the phone call part).....does all the same stuff, just a bigger screen...

So...convince me I need to spend another $500 on a big version of my phone...