Nvidia got a license from Intel to produce 1600MHz FSB products. This is quite logical, since Intel themselves never really made the gaming community happy. With Nvidia making the chipsets Intel makes sure this market stays satisfied. Secondly, just like Intel used ATI chipsets on their boards some time ago Intel will now use Nvidia chipsets in their products.
More surprisingly Nvidia also got a license to use CSI and produce Xeon chipsets. This is quite a major thing since the Xeon chipset market never has been really big. The current platform has some downsides like the memory subsystem and no official SLI/Crossfire support. If the memory issues get fixed by NV (ie dropping FB-DIMMs) is just wishful thinking at the time being, SLI support sounds very obvious though.