Not so sure you can consider my Xbox 360 a gadget but that's what would be mine if I had to pick a favorite. I hate my iPhone 3G as it's been the biggest pile of crap since iOS4 came out.
Can't think of anything else that would really be my favorite.. Maybe my Drobo FS if I had to just guess
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Only because this was bugging me: It should be 'What are your favorite gadgets?' since you have the plural of gadget. You would use 'is' if it was singular ('What is your favorite gadget'). /offtopic