In the closet. I keep telling myself I am going to use them for something one day.
I actually used mine until I got my Hyper 212. Its currently in box/closet as I just moved my wife off of S939 and only S775. I might upgrade her stock cooler with mine as its slightly better, or just sell on CL for $5.
Mine is in the box, no reason to throw it away because the aftermarket one that is in use might fail eventually. Backup cooler:).
Drive down the road and throw them at kids.
Keep it in the Box in case the CPU gets resold when prices on better CPUs drop !!
I am using water cooling so if I ever throw this CPU at my other crappy computers, it would have a heatsink to run at stock speeds lol.