A one-handed long-handled grabber-looking thing that prunes climbing roses that are high up. It picks off the stem and holds it so that you can deposit it in the barrow without getting prickled.
Double-handed silicone oven gloves that are like big mittens with a central section. They never get grease stains or scorch marks or wet through.
A multi-bladed herb chopper that picks up the choppings as it cuts them. You just put them on the chopping board, roll it back and forth and it chops and picks up. It's easy to rinse out too, which is a big plus as so many kitchen gadgets don't get used if they are tricky to clean.
A jar key. I would hate to be without it now.
I have one of those little onion comb things too. I had to use it when DBH was picky about onion having to be very fine, but he isn't so fussy now. However what I use it most for is pricking damsons and sloes before making gin. It's very useful when used with a quick stabbing motion on a large trayful.