All the attachments on my Kenwood blender except the blades. I bought a halogen oven once but it looked so complicated I never even tried it. Then yesterday on my government-approved walk (yawn) I saw one working in someone's kitchen, it looked all warm and glowy in the otherwise dark kitchen and I regretted chucking mine out.
What else? Coffee maker (I hate coffee, it's mystery why we got that), iPod ( a few years ago, couldn't get to grips with the little bugger).
Microwave. We only ever used ours for jacket spuds and heating baby bottles (shoot me, I know it's verboten), but when it broke we bought another. Within a week our daughter put metal foil in it and blew the bloody thing up so we didn't bother getting another and we don't miss it.
So much wasted cash.