Slow cooker for me too - was very disappointing as I cook loads of stews so thought it would be really handy, but I could just never get them to taste good so now it's gathering dust at the back of the cupboard. I've found a friend who's agreed to take it off me though.
Also my electric piano. To be fair I did use this loads for the first year I had it, but it takes up so much space that it's difficult to set it up in my current house, so i haven't touched it for years. Feel really bad though as it was a birthday present from my parents and i know they're expensive 