The new Xeon W5580 is here and it is stupid fast. It's based on the Nahelem architecture which means that like the i7, the W5580 uses socket LGA1366 and supports tripple channel DDR3. The downside is that if you own an older Xeon you will have to upgrade your motherboard before moving to the new Xeon W5580.
This CPU is expensive but it's much faster than anything else on the market. It beats the best Intel Core i7 in every benchmark.