I want a version of Gmail that can run offline on my iPhone. I currently use Gmail, and it works fine with my iPhone's Mail program, but the paradigm shift between it and Gmail is a bit of a pain. iPhone's Mail doesn't have search, and doesn't organize things by thread. If someone at Google can port offline Gmail over to the iPhone, that would be two shades of awesome!
Can't wait till google gears is available for mobile Safari. It'll make my ipod touch more fun to use (I'm not always around wifi..).