If you're experimenting with overclocking the CPU of your Raspberry Pi and enjoy making different things then the following system by Instructables member Unprecedented may be of interest. They have created a water-cooling system for the CPU which is based around some 3D-printer parts and the typical water pipe with pump found on desktop equivalents.
The first stage of heat transfer is using a copper plate - and in this case an older US one cent piece due to the high copper content, those of us in other locales will need a small piece of copper cut to size. Otherwise the rest is straight-forward and explained in the following video:
As part of our increasing range of Raspberry Pi-related products we have the PiBreak - a prototyping board for the Raspberry Pi. It provides labelled breakout pins for all GPIOs, a large prototyping area with solder pads, and power rails for easy power connection:
Furthermore the PiBreak also includes mounting hardware to firmly attach it to your Raspberry Pi using a nut, bolt, and spacer - and is compatible with all revisions of both model A and B Raspberry Pi computers. For more information about our new PiBreak board, our Getting Started guide, and to order - visit the product page.