As of now: My small Bluetooth speaker; the Audio Pro T5. I find myself preferring this to my (rather state of the art) home cinema/stereo system. (...and I suppose this is/can be guitar related, as it plays music....) It's loud, clear and provides enough low end to a level that a mate of mine asked, "dude, where's the sub?" Another favourite is my Sabatier chefs knife. Not really a gadget I suppose, but it does a very good job with helping me make some really mediocre dishes.... How about yous?