Anandtech Sandy Bridge review.
This is undoubtedly the next big thing in CPUs. Sandy Bridge is Intel's next generation CPU architecture, with a improved performance and energy efficiency. The link above goes into quite a lot detail about the new features like AVX, and the on die graphics. The new Core i5 2500K and Core i7 2600K CPUs are just offering incredible performance for the price. The ~$200 USD i5 2500K is being overclocked to 4.7 -> 4.8GHz with simple air cooling. The i7 2600K can go even further, I've seen one instance of 5GHz on the 2600K. Amazing performance at an amazing price.