RC Helicopter - bought one first time, broke it, repaired it - sold it at a loss on eBay
Bought another one a coupleof years later and only used it a few times - not bothered selling that yet.
PS3 + Games - I buy a new game and play it for an hour or so then never touch it again, has had months of being switched off
Xbox 360 + Games - Same as PS3 really, haven't used it in over a year
This PC - Spent over £1k on it around a year ago, not played a single game on it since apart from when I first built it , only use it for browsing + listening to music
Fax machine - god knows why I bought this, never use it as my PC has a modem to send/receive faxes
Weights bench - kept this for a few weeks then decided to buy a seperate bench and power rack, so it got dismantled and hidden in a corner somewhere
Trainers - Have far too many pairs (50?) some which I don't even like and have never taken them out of their box
32" CRT TV - Used it for 1 week when my old TV broke then decided to buy a 42" Plasma , gave the CRT away
Surround sound Setup - Bought this at same time as Plasma, wired up the speakers + subwoofer + amp etc. switched it on once and never watched a movie/played a game on it since
iPhone - Bought this when they were quite new for more than £300 , used it for only a few weeks , developed a fault and couldn't be bothered to get it repaired - been sitting in my drawer for at least a year and now out of warranty
Far too much stuff I've wasted money on in the last few years