Microplane Zester/Grater: It's handy for grating fresh garlic, ginger, citrus, and hard cheeses. And unlike a box grater (which also has its place), it's easy to hold and use directly over a pot or bowl.
Citrus Juicer/Squeezer: Using this presser is quickest way to juice citrus and separate out the seeds. It involves less of an arm workout than the kind that requires you to twist by hand, and it's easier to clean and store than an electric gadget.
Salad Spinner: You can use this for more than just washing and drying lettuce. Use it with berries so they last longer in the fridge, or with cruciferous vegetables like broccoli and cauliflower—which need to be very dry to roast properly.