Sugru
Got a gadget that needs fixed, a handle that's rubbing you the wrong way, or just an urge to play with the adult equivalent of Play-doh? Get yourself some Sugru ($10-$20). This modeling clay/super glue/alien symbiote forms a lasting bond between a variety of materials, and cures to a tough silicone overnight, making it weatherproof, flexible, and generally indestructible. If only we could say the same about our gadgets.