Can I get the Canon EOS Utility to stop bugging me when I plug in my iPhone?
Solution 1:
After plugging in your iPhone, open "Image Capture.app" in the Applications folder. In the bottom left of the window is an option to choose what to do when this "camera" is plugged in. Change this to Do Nothing or open iPhoto as you would prefer.
Solution 2:
You can also try installing Cameras, which will let you select default actions depending on the camera you plug in.