Silverstone looks to shake things up with their Super Slim series of Tundra all-in-one liquid CPU coolers. The TD03-SLIM is the smallest of the bunch at just 37 mm thick with the fan included. The Tundra TD03-SLIM could very well be the answer to your CPU-cooling conundrum for all those tiny systems where space is at a premium.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips