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Impressive Project. I've been trying to do the same thing for a couple years with different cameras on arduinos and am now trying a Seeed Camera shield with SD card on a Seeed Stalker. The shield has a sophisticated image processing chip which further complicates the task but should give better images. Getting the radio and the camera both using serial ports and still having the serial monitor work is problematic. You must have done it without the serial monitor for debug. Doubly impressive. Your arduino code is elegantly simple. I'm using XBees in synchronous sleep for long range transmission on solar power which complicates the timing.
Image Capturing Bird Feeder