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Since the ipod uses wifi, the image isn't compressed. Otherwise, when you send data, the iPhone automatically compresses it to optimize speed
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Aha! Mystery solved!
It's interesting that the iPhone doesn't send it uncompressed when on WiFi. I know this to be the case, because I sent myself a test screenshot while on WiFi. I wasn't really thinking about WiFi as a factor at the time, though. (Unless it just uses different levels of JPEG compression? I am assuming the Touch sends PNG, and the iPhone sends JPEG? I don't have a Touch, so dunno.)
I assume the OP is just taking a screenshot by pressing the home and wake buttons, so he doesn't have the option of Zipping it. Or can an app take a screenshot?
I don't think zipping it will help with size. (The OP wasn't complaining about size, anyway - just the difference in quality between the two devices.) The PNG is already losslessly compressed, and it uses an algorithm optimized for images. I doubt that Zip would compress it further. If anything, it is likely to grow ever so slightly.
