After trying to stuff the intervalometer circuit into a jar a few days ago, it just hasn't worked right. LCD goes blank in trigger and shoot modes, and it doesn't trigger the camera, though the serial output is right. The backlight "peek" function has stopped working too.
Using the protoshield on my "proper" Arduino has been too limiting space-wise anyway-- time to transfer to a bigger breadboard with an Boarduino or iDuino to sort things out and finalize the controls and ports in Eagle, plus I'll have room to mess with audio amplifier circuits and FZ20 vs. EOS remotes.
Had an idea about an Arduino variant this morning (in the shower of course) but wonder if something like it has been made already... is there a comprehensive list of *duinos anywhere?