Bold the ones you have and use at least once a year, italicize the ones you have and don't use, strike through the ones you have had but got rid of.
I wonder how many pasta machines, breadmakers, juicers, blenders, stick blenders, deep fat fryers, egg boilers, melon ballers, sandwich makers, pastry brushes, cheese knives, electric woks, miniature salad spinners, griddle pans, jam funnels, meat thermometers, filleting knives, egg poachers, cake stands, garlic crushers, martini glasses, tea strainers, bamboo steamers, pizza stones, coffee grinders, milk frothers, piping bags, banana stands, fluted pastry wheels, tagine dishes, conical strainers, rice cookers, steam cookers, pressure cookers, slow cookers, spaetzle makers, cookie presses, gravy strainers, double boilers (bains marie), sukiyaki stoves, ice cream makers, canners, mandolines, electric grills, and fondue sets languish dustily at the back of the nation's cupboards.
[mme_hardy's note: I added a few. Feel free to do the same.]
[DX's note: As did I.]
Some other notes: I used to use the breadmaker all the time before I got my stand mixer. Now I just use that. I used to use my bamboo steamer a lot during sweet corn season, but then I noticed the vegetable settings on my microwave. Corn season is already humid enough without adding steam. The rice cooker is a microwave version, not a stand alone. I did once have a blender, but then I traded it to my ex-wife for her stereo. Now I get by with the stick blender and the food processor.