Do you have an iPhone? I have an iPod Touch. Do you use vectors? Do you think RPN calculators are the bomb? Here is a RPN calculator for the iPhone that supports vector notation. VCalc by Silicon Prairie Ventures Inc. Oh - it is free. Here is a screen shot.
I played with it some, the only thing that would be cool would be a landscape mode.
Nice. I will add this to my collection of free or cheap iTouch calculators and converters.
Vector Calculator (for about a buck) is also good. It is not RPN but it is graphical. You might also look at Vector Addition Calculator.
This isn't a iPod app (it's for Mac). But it isn't a "looks like a real calculator" calculator.