These look quite cool.
![Cool](https://bitcointalk.org/Smileys/default/cool.gif)
ModMyToys Solid Copper Passive Micro-Heatsink - 8mm x 8mm x 8mm (Pack of 4) - Black Electro-Plated-(MMT-HS-8X8-CU-BK)
http://www.frozencpu.com/products/14951/vid-177/ModMyToys_Solid_Copper_Passive_Micro-Heatsink_-_8mm_x_8mm_x_8mm_Pack_of_4_-_Black_Electro-Plated-MMT-HS-8X8-CU-BK.html
Those are a bit dear! I'd be going for these cause copper doesn't transfer heat to the air very well either.
http://dx.com/p/aluminum-cooler-heat-sink-chipset-for-ram-memory-w-type-8-piece-set-35816
You could just stick a load to the top 'heatsink' side if they dont fit on the little chips on the other!
This is pretty cool tho:
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fhackadaycom.files.wordpress.com%2F2013%2F06%2Fminer.jpg%3Fw%3D620%26h%3D375&t=614&c=vQl41AQjqvVQ0A)
RPi sandwiched between a USB hub and LCD shield. It's doing a lot better than my Pi which can get about 0.47khash on litecoin...